Best Brake Line Flaring Tool: Top Choices Reviewed

You don't want to pay your local service center to replace brake lines when you can do it yourself. Get the best brake line flaring tool to upgrade your system.

If you want to save money on brake repairs, it pays to have the best brake line flaring tool. While it’s not something you will use every day, it can save a good amount of money versus heading to the mechanic.

We review the best brake line tool so you can get back on the road faster.

Best brake line flaring tool - brake repair

What is a Brake Line Flaring Tool?

When replacing a brake line, it’s required that you perform a double flare on the connection. To do this, you will need a hydraulic brake flaring tool. With this tool, it is simple to create the connections needed to replace segments of your vehicle’s brake line.

Top Benefits of a Brake Line Flaring Tool

With a brake line flare kit, you receive several benefits.

  • Save money over visiting the mechanic. By owning the brake line tool, you can do your own car repairs. Not only does this save you money, but also time. There’s no need to wait for your auto repair shop to have time to fix your vehicle when you can do it yourself.
  • Use for other projects. The brake flare kit works on other types of tubing. Just make sure you purchase one that is versatile to work on multiple diameters and materials.
  • Simple to use. You don’t need any special skills to use the flare tool kit. With a little practice, you can quickly become a pro.
Source: BMW Car Club of America

Why Replace Brake Lines?

Brake lines play an important role in the operation of your braking system, but they are often overlooked. You probably won’t think about the function of the brake lines until there is a problem. However, there are several reasons why a brake line might need to be replaced, requiring the use of the best brake line flaring tool. 

Brake Fluid Leakage

The rubber brake lines can degrade over time. As they begin to fail, they will seep brake fluid through the weakened layers of material. If left unchecked, the lines will eventually leak faster, which can create trouble braking.

Rubber lines are more susceptible to leakage than steel lines, but the metal material does not make the brake lines invincible. Steel lines can also wear out as they get older.

If you notice a large amount of fluid leaking, the lines might have busted completely and caused a significant crack. Aside from the effects on the braking system itself, dripping fluid can also lead to damaged wheel speed sensors or brake sensors if the liquid comes in contact with these electrical components.

Brake Warning Light Illuminates

Most often, the brake light comes on because the sensors on the pads indicate that they are worn and need to be replaced. However, the brake warning light can also come on when the fluid levels are dropping. Cracked and leaking brake lines can cause this to happen.

Spongy Brake Pedal

When fluid is leaking, you might also notice a spongy brake pedal. This squishy feeling is caused by air that leaked into the brake system and takes up space where fluid should be. Shaking while braking isn’t generally a brake line issue, but still requires attention.

Things to Consider Before Buying Brake Line Flaring Tool

You can’t just head out and purchase any brake pipe flaring tool that you find. There are some special considerations to factor in, so you pick the best option. If you don’t follow these guidelines, you could end up buying a tool that doesn’t do what you need.

Proper Application

You want a brake flaring kit that is meant to work on your brake lines. However, if you plan to use it for other applications, it’s important that you choose the right model. You can find kits that are also useful for HVAC applications.

Adapters

You will find a variety of adapters with the various kits. You will need these adapters when working with a challenging section of lines. You might prefer to buy a comprehensive kit up front instead of waiting to see what you need. After all, you don’t want to stop mid-project to run out and get an adapter.

Storage & Portability

With the right storage case, you can take your tools on the go. The cheaper kits come with a plastic tray that holds all of the components. This might seem like enough, but it’s going to become cumbersome to deal with.

Instead, look for a durable, molded case that can withstand impact. You can keep this with you on the go for jobs anywhere.

Construction

You want a high-quality tool that’s going to live up to the expense. Investigate what materials it is made of to ensure it will last. Remember, it doesn’t have to be heavy to be durable. There are plenty of high-quality materials that are also lightweight. However, nothing can quite compare to a stainless steel brake line flaring tool.

Efficient

A double flare tool allows you to fit lines more efficiently. Check over all three parts of the tool, including the metal piece, metal bar and crew, to ensure it will get the job done quickly. The most efficient option allows you to form fittings without much hassle.

Price

The single flare tool is going to cost much less than the best double flare tool. However, you won’t be as quick with your jobs and might get frustrated. We recommend buying a high-quality tool from a reputable manufacturer, even if it costs a little more.

10 Best Brake Flare Tool Options: Complete Reviews

1. OTC 6502 Master Brake Flaring Tool Kit Review

OTC 6502 Master Brake Flaring Tool Kit

If you have to perform your own brake line repairs, you want a complete kit to ensure everything is nearby during the fix. This complete set from OTC ensures everything you could need remains handy. You will look like a professional mechanic with all of these included parts.

With this professional brake line flaring tool, you can perform many different types of flares. Use it for a single flare, double flares and bubble flares. It also includes other tools that are useful, such as a tube cutter, adapters, a flaring bar, deburring tool and an arbor press. It also works with a variety of brake line sizes.

All of these parts are found in a strong, durable carrying case. Since it weighs just four pounds, you can take it anywhere for brake repairs on the go. Plus, the price is reasonable, ensuring you don’t break the bank.

While the majority of the customer reviews point to how exceptional this set is, there has been one significant complaint. It seems that the debarring tool gouges copper and nickel lines when too much pressure is used. While this isn’t a deal-breaker, it’s something to keep in mind while using this tool.

Features

  • Types: Single, Double, Bubble
  • Line Size: 3/16” – 5/8”
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Lightweight & Portable
ProsCons
Complete kitDefects with deburring tool with too much pressure
Lightweight storage case 
Versatile 
Tube cutters easy to use 
OTC 6502 Master Brake Flaring Tool Kit
  • Covers single double and bubble type flares
  • Single flare standard lines 3/16 inch - 5/8 inch and single flare metric lines 4 millimeters - 14 millimeters
  • Double flare standard lines 3/16 inch - 1/2 inch and double flare metric lines 4 millimeters - 10 millimeters
  • Bubble flare standard lines 3/16 inch - 1/2 inch and bubble flare metric lines 4.75 millimeters - 10 millimeters
  • Kit contains flaring bar, arbor press, adapters, tube cutter, and debarring tool - all in a hard case

2. Neiko 20657A Bubble Flaring Auto Tool Kit Review

Neiko 20657A ISO/Bubble Flaring Auto Tool Kit | 9 Piece | 4.75, 6, 8, 10 mm | For Car Mechanics, regular

This durable nine-piece kit comes in a bright, blow-molded case for portability. It’s designed to be used with metric soft steel lines that require bubble flaring. With this kit, you receive four adapters for 4.75mm, 6mm, 8mm and 10mm tubing.

The kit also includes a yoke assembly, flaring bar and wrench/gauge. Whether you drive a foreign or domestic vehicle, this brake line kit should get the job done. It’s a great choice for the DIY mechanic or professional.

Even beginners find this set easy to use, thanks to the company’s detailed instructions. However, not everything is rosy. Some of the materials used with these tools are on the lower-end side. If you are planning to use the kit repeatedly, you might do better upgrading to something that’s built stronger for longevity.

Features

  • Types: Bubble
  • Line Size: 4.75mm, 6mm, 8mm and 10mm
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Perfect Bubble Flare Creation
ProsCons
Portable kitMaterials are lower-quality
Cheap 
Works with most car brands 
Detailed instructions included 
Sale
Neiko 20657A ISO/Bubble Flaring Auto Tool Kit | 9 Piece | 4.75, 6, 8, 10 mm | For Car Mechanics, regular
  • [APPLICATION]: Make your own brake lines with the bubble Flaring I.S.O tool Kit, designed for metric soft steel brake lines requiring an "ISO" or bubble style flare for use on soft steel tubing used in automotive brake systems.
  • [EASY TO USE]: Lever-lock flaring bar makes tool kit easy to use for professional and DIY mechanics at the garage or at home.
  • [VERSATILE]: Suitable for foreign (Honda, Hyundai, Toyota, Subaru, etc) car manufacturers and domestic (Ford, Chevy, GMC, etc.) vehicles (cars, SUVs, light trucks).
  • [INCLUDES]: Yoke assembly, Flaring bar, Gauge/wrench, 10mm tubing, 4 adapters for 4.75mm, 6mm, 8mm for a complete bubble flaring tool set.
  • [CONVENIENCE]: Blow molded hard plastic storage case provides a convenient handle for easy travel and portability, and stores/organizes the kit for easy accessibility for your jobs on the go.

3. OTC 4503 Stinger Double Flaring Tool Kit Review

OTC 4503 Stinger Double Flaring Tool Kit

If you want to make single or double flares in a variety of materials, this kit is a great option. You can use it with brass, aluminum or copper tubing, plus soft steel brake lines. The kit even includes five adapters for a variety of brake line sizes.

You won’t find an easier kit to use with the chrome-plated alloy steel swivel. This design helps to reduce friction while you create a seamless flare. Because the yoke is forged and heat-treated, you know it is built to last. That’s why this kit is regularly rated as the best for durability and performance.

If you want to take your tools on the go, you will appreciate the molded plastic storage case. All of your tools remain in one location for that next brake line job. Plus, the lightweight design allows you to take it anywhere.

Why pay more for another kit if you don’t have to? However, if you require a deburring attachment, you will either need to purchase additional equipment or choose another kit from our list because this set doesn’t contain one.

Features

  • Types: Single, Double
  • Line Size: 3/16″, 1/4″, 5/16″, 3/8″, and 1/2″
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Chrome Plated Alloy Steel Swivel
ProsCons
Durable caseDoesn’t include deburring attachment
Low-cost 
Works with many materials and sizes 
Strong, reliable tools 
Sale
OTC 4503 Stinger Double Flaring Tool Kit
  • Designed to make double or single flares in copper, aluminum, and brass tubing as well as soft steel brake line tubing
  • Chrome plated alloy steel swivel reduces friction and helps ensure a smooth, even flare
  • Comprehensive set includes five adapters - 3/16, 1/4, 5/16, 3/8, and 1/2 inch (4.8, 6.4, 7.9, 9.5, and 12.7 mm)
  • Forged, heat-treated steel yoke for long term performance and durability
  • Rugged blow molded plastic storage case keeps tools contained and organized so they are ready when you need them

4. Neiko 20656A Auto Double Flaring Copper Aluminum Steel Brake Line and Brass Tubing Tool Kit Review

Neiko 20656A Auto Double Flaring Copper Aluminum Steel Brake Line and Brass Tubing Tool Kit | 9 Piece | 5 Adaptors | 4.8 mm – 12.7 mm | 3/16” – 1/2'' | For Car Mechanics or HVAC'

If you want to perform professional single or double flares with multiple materials, this Neiko kit is built to impress. It works with soft steel brake tubing, copper, brass, magnesium and aluminum. You can also use it in HVAC applications for increased versatility.

Additionally, it can be used with five size adapters, although some users have had trouble with the 3/16″. Because the kit is made from forged, heat-treated steel, you know it’s going to last many years. You can count on the strength and durability to help you complete many brake line jobs.

The company also uses a chrome-plated alloy steel swivel to reduce friction and make your task easier. Whether you are replacing brake lines or working with transmission or cooling replacements, you will be able to get back to life quicker because of this unique design.

What’s more, the company includes a blow molded plastic case so you can take your tools on the go. You’ll never be without your brake line flaring tool kit when you need it the most.

Features

  • Types: Single, Double
  • Line Size: 3/16″, 1/4″, 5/16″, 3/8″, and 1/2″
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Heat-treated Steel Construction
ProsCons
Detailed instructions includedIssues with 3/16″ attachment
Comes with durable case 
Strong construction 
Easy to use 
Neiko 20656A Auto Double Flaring Copper Aluminum Steel Brake Line and Brass Tubing Tool Kit | 9 Piece | 5 Adaptors | 4.8 mm – 12.7 mm | 3/16” – 1/2"" | For Car Mechanics or HVAC"
  • [APPLICATION]: Designed to use when flaring double or single flare in a variety of material: copper, aluminum, brass, magnesium, and soft steel brake line tubing for brake/fuel lines, HVAC and a variety of other applications.
  • [PRO GRADE]: Heavy duty design is forged from heat treated steel to ensure durability and strength to increase the service life and longevity of this brake line and tubing flaring tool set.
  • [DESIGN]: Alloy steel and chrome plated material is used to construct the swivel to assist in reducing friction for an easier task to execute professional looking jobs with brake line or transmission cooling line replacements, and more.
  • [INCLUDES]: Wide range of sizes: 5 adaptors- 4. 8mm through 12. 7mm (3/16, 1/4, 5/16, 3/8, 1/2").
  • [CONVENIENCE]: Blow molded hard plastic storage case provides a convenient handle for easy travel and portability, and stores/organizes the kit for easy accessibility for your jobs on the go.

5. OTC 6504 Deluxe ISO Bubble Flaring Tool Set with Cutter Review

OTC 6504 Deluxe ISO Bubble Flaring Tool Set with Cutter

When the time comes to make single or double flares, you want this kit on your side. It’s perfect for working with soft steel brake lines, plus aluminum, brass and copper tubing. It also includes four adapters for complete versatility.

As with other brake line flaring kits from this manufacturer, you get an exceptional product for a reasonable price. The steel yoke is created from forged, heat-treated steel for a long life. The kit also includes a chrome plated alloy steel swivel to keep friction to a minimum, thereby allowing you to create an even, smooth flare.

With the blow molded storage case, your tools remain in one place until you are ready to use them. You’ll likely find plenty of excuses to break them out. With the detailed instructions that are included, you won’t have to wonder what to do next.

However, be careful when using the tools because the clamping process has been known to create some brake line damage. Thankfully, this isn’t a rampant problem, so probably nothing to be too concerned about.

Features

  • Types: Single, Double, Bubble
  • Line Size: 4.75mm, 6mm, 8mm, and 10mm
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Forged, Heat-treated Steel Yoke
ProsCons
Easy to useTrouble with clamping process
Reasonable price 
Work on many materials and sizes 
Portable 
OTC 6504 Deluxe ISO Bubble Flaring Tool Set with Cutter
  • Designed for metric steel brake lines where an ISO or bubble flare is required
  • Includes the number 6514 tubing cutter
  • Adapters for 4.75mm 6mm 8mm and 10mm tubing
  • Housed in a plastic blow-molded case

6. Shankly Flaring Tool Set Review

Shankly Flaring Tool Set (10 Piece - Professional Grade), Heavy Duty Steel Flaring Tools Kit and Swage Tool, Flaring Tool with Tubing Cutter Included. (This is not a Double Flaring Tool).

Shankly might not be as recognizable as a name as the other kits, but you don’t want to overlook this line flaring tool. This inclusive kit includes a durable tube cutter, allowing you to accomplish a variety of jobs. With that said, it’s important to note up front that it cannot be used for double flares, so it’s not always the best choice for brake lines.

However, it comes with more adapters than most other options on the market, ensuring you never need to run out at the last minute for a tool. The flaring cone and adapters are constructed from durable steel, making it the last line flaring tool you might ever need to buy.

The tools also include a sleek chrome finish for added durability. With the kit, you receive two bars that cover nine sizes, plus a slip-on, self-centering yoke to create professional-looking flares. Your friends might even stop by to have you work on their lines too. Maybe you will start a business out of it.

As with the other options, you receive a durable case that keeps all of the tools, big and small, in one location. With everything right at your fingertips, you get your jobs done far faster.

Features

  • Types: Single
  • Line Size: 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″,  and 5/8″
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Chrome Finish
ProsCons
Handy case includedCan’t be used for double flares
Wide range of adapters 
Durable construction 
Highly rated 
Shankly Flaring Tool Set (10 Piece - Professional Grade), Heavy Duty Steel Flaring Tools Kit and Swage Tool, Flaring Tool with Tubing Cutter Included. (This is not a Double Flaring Tool).
  • ALL INCLUSIVE KIT: Shankly’s flaring tool kit is all inclusive, complete with a professional a tubing cutter, allowing the mechanic to focus on the job rather search for parts. Please note: this is a standard flare tool, NOT a double flaring tool.
  • WIDE RANGE OF FLARE ADAPTERS: flaring tool adapters range from the following sizes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", making this the only flaring tool set a mechanic will need. (Metric: 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm)
  • COMMON SWAGE FITTINGS: Shankly flaring tools include five swage fittings and several useful tube sizes: 3/16”, 1/4”, 5/16”, 3/8”, 1/2”, 5/8”, creating a rugged and long lasting flaring tool, swaging tool kit.
  • PRECISE AND CONVERTIBLE: This flaring kit swivel-type swaging adapters and flaring cone are made of the sturdiest steel materials and chromed finished for easy operation and precision.
  • SELF-CENTERING YOKE: Shankly's brake line flaring tool includes two bars covering nine sizes with a self-centering, slip-on forged steel yoke to help form professional and quality flares and swages.

7. MASTERCOOL 72475-PRC Universal Hydraulic Flaring Tool Set Review

MASTERCOOL 72475-PRC Universal Hydraulic Flaring Tool Set with Tube Cutter, Blue and Silver

Professional mechanics are going to want something more than a basic brake flaring tool kit and this option fits the bill. It comes with everything you could want or need while working on brake lines. Create single, double and bubble flares with this one tool.

You can use it on a variety of materials, including brake lines, transmission lines, annealed steel and others. Plus, there are a multitude of adapters, ensuring you get the size that suits the job best. What’s notable about this set is the strong, reliable case. It’s not just your average plastic case, but clearly meant to provide years of protection.

The construction of the tools is also worth mentioning. With the magnetic adapter, all adapters stay securely in place. Plus, the strong yet lightweight construction makes it easy to use the tools for longer periods without discomfort.

While this kit might provide everything you need, it’s important to consider the price. For most home users, it would be impossible to use this set enough to justify the cost. However, professional mechanics that regularly work on hoses and automotive lines are going to use this regularly, making it well worth the expense.

Features

  • Types: Single, Double, Bubble
  • Line Size: 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 1/2″,  and 5/8″
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Magnetic Adapters
ProsCons
Secure gripExpensive
Designed for professional mechanics 
Complete set of tools 
Unique magnetic adapters for a great fit 
MASTERCOOL 72475-PRC Universal Hydraulic Flaring Tool Set with Tube Cutter, Blue and Silver
  • TUBE AND DIE SET STABILIZING ARM for easy tube forming
  • MAGNETIC ADAPTER holder keeps adapters in place
  • EQUIPPED WITH AN ENGLARGED DIE SET COMPRESSION AREA for better grip of dies
  • THIS TOOL CAN BE USED ON "annealed steel" & "dead soft"
  • INCLUDES dies and adapters to fabricate push connect 1/4, 5/16 and 3/8"; GM fuel line flare, brake lines and transmission 5/16 and 3/8"; flare/double flare 3/16, 1/4, 5/16, 3/8 and 1/2"; metric bubble flare 4.75, 6, 8, and 10mm, mini tube cutter for 1/8" to 5/8" (3 - 16 mm) O.D. tubing (1/8 to 1/2" nominal) all packaged in a custom blow molded case

8. Titan 51535 3/16-Inch Double Flaring Tool Review

Titan 51535 3/16-Inch Double Flaring Tool

If you are looking for one specific size, you can opt for this double flaring tool instead of purchasing an entire kit of parts you may never use. This set comes with the 3/16″ double flaring tool and removable handle, plus a positioning bolt, die lubricant and double ended OP1/OP2 punch.

With this tool, you can create an inverted 45-degree SAE double flare with your 3/16″ nickel, copper or steel tubing. However, you don’t want to use it on stainless steel materials. If this size doesn’t work for you, Titan does make other options, including the 1/4″ flaring tool.

Unlike our other options, this design is completely compact, making it easier to get into tight spaces under the car. With this tool, you can quickly replace brake lines at most any location on the vehicle. You can also remove the handle to use it in a bench vise.

Clearly, the price is a little high for what you get, especially since it doesn’t come with other tools or a carrying case. However, customers that have used it can’t say enough good about the design, construction and functionality.

Features

  • Types: Single, Double
  • Line Size: 3/16″
  • Complete Kit: No
  • Includes Storage Case: No
  • Compact
ProsCons
Easy to get into tight spacesExpensive
Durable constructionOnly one size
Works with many materials 
Creates perfect inverted 45-degree SAE double flare 
Titan 51535 3/16-Inch Double Flaring Tool
  • Set Contents: (1) 3/16-Inch Double Flaring Tool with Removable Handle, (1) Positioning Bolt, (1) Double Ended OP1/OP2 Punch, (1) Container of Die Lubricant
  • Creates a perfect inverted 45-Degree SAE double flare with 3/16-inch steel and nickel-copper tubing. Not recommended for use on stainless steel tubing.
  • Can be used on the vehicle! Compact design can be used in tight under-car spaces allowing user to repair brake lines in place on the vehicle.
  • Handle can be removed if you prefer to use in a bench vise.
  • SAE Double Flare is an inverted 45-Degree flare typically used in automotive brake line applications. 3/16-Inch brake lines are on almost all cars and trucks making this flaring tool usable with most vehicles.

9. ABN Auto Double Flaring Kit Review

ABN Auto Double Flaring Copper Aluminum Soft Steel Brake Line and Brass Tubing Tool Kit

You shouldn’t have to spend a lot of time getting your brake line flares completed, and you won’t have to with this kit. ABN Auto ensures that all single and double flares are done quickly, at a reasonable cost. Use this kit on soft steel, magnesium, brass, aluminum or copper piping.

It includes a variety of adapters, ensuring that you can complete any job without heading to the auto parts store. The only thing this kit doesn’t contain is the tube cutter, but you likely already have one on-hand.

The solid construction truly sets this low-cost kit apart from the rest. With the alloy-steel constructed swivel, there is less friction, which keeps the tubes from breaking. Additionally, the tool kit is constructed from heat-treated steel so the parts aren’t going to break or crack under pressure, even when you are using them excessively.

Plus, the tools will never again be lost in your tool chest with the help of the lightweight blow-molded case that keeps everything organized and portable. Keep in mind that some users have commented that it can be more challenging to complete a double flare, but if you follow the instructions you shouldn’t have any trouble.

Features

  • Types: Single, Double
  • Line Size: 3/16″, 1/4″, 5/16″, 3/8″, and 1/2″
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Alloy-Steel constructed Swivel
ProsCons
Includes a variety of adaptersNo tube cutter
Strong steel constructionMore effort to create double flare
Reasonable price 
Highly rated 
Sale
ABN Auto Double Flaring Copper Aluminum Soft Steel Brake Line and Brass Tubing Tool Kit
  • [Brake Line Flaring Made Easy]: To efficiently double or single flare in copper pipe, aluminum, brass, magnesium, and soft steel, use the ABN Brake Line Flaring Tool Kit
  • [Less Friction for Your Projects]: Excessive friction can cause stress and wear on tools and break tubing; Double flare tool kit includes swivel constructed out of alloy steel and chrome plated to reduce friction
  • [Built to Last]: Brake flaring tool kit forged from heat-treated steel; Double flaring tool kit will not crack or break under pressure after repeated, extended use
  • [Storage Case]: No need to worry about tube flaring tool kit getting lost in a toolbox drawer; Double flare tool package includes lightweight plastic blow-molded storage case for easy transportation and organization
  • [Package Contents]: Brake line flare kit includes adapter SAE sizes 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, 1/2-inch; Brake line flare tool package also includes flaring tools sizes 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, 1/2-inch

10. GEARWRENCH 12Pc. Tubing Service Set Review

GEARWRENCH 12Pc. Tubing Service Set - 41590D

If you are looking for a classic set complete with a durable construction, this tool is going to impress. It might not be as sophisticated as the higher-priced models, but it gets the job done and it is made from exceptional materials.

This flare kit includes a traditional tool and a vast range of dies, making it easy to double flare popular sizes. It also comes with your cutting tool, deburring tool and a tubing bender. All-in-all, you should be able to create a solid brake line for a multitude of models.

This kit comes complete with a durable storage kit so you won’t lose those smaller parts ever again. After all, once a small component goes missing, the set can be complete junk if it is something you needed.

While the customer reviews speak favorably about this kit, it’s important to mention that some feel the castings are a poor design. Thankfully, there’s a warranty and reliable customer service team to help you if you run into any trouble.

Features

  • Types: Single, Double
  • Line Size: 3/16″, 1/4″, 5/16″, 3/8″, 7/16”, 1/2″ and 5/8”
  • Complete Kit: Yes
  • Includes Storage Case: Yes
  • Durable Deburring Tool
ProsCons
VersatilePoor castings design
Reliable company 
Easy to use with multiple materials and sizes 
All in one kit 
GEARWRENCH 12Pc. Tubing Service Set - 41590D
  • For Tubing Service
  • Broad Tubing Application Including Double Flare, Bend, Cut, Ream, and Deburr
  • Includes adapter sizes: 3/16 in 1/4 in 5/16 in 3/8 in 7/16 in 1/2 in 5/8 in
  • Included Mini tubing cutter, Tubing bender, Deburring tool, 7 piece flaring adapter kit, Holding bar, Yoke for flaring tool
  • Includes blow mold case for storage and organization

Replacing brake lines
Source: Car Throttle

Brake Flaring Tool Types

As you look for a flaring tool for brake lines, you will find these three types. Choose the one that best fits your needs.

Traditional

With this flare tool, you use a yoke and bar to flare the brake lines. The bar clamps the line in place while the yoke drives the flare adapter on the line and creates the flare. While the majority of these tools won’t require additional parts, there are a few exceptions.

Hydraulic

With the help of hydraulic power, these tools drive the adapter onto the line instead of using a fastening design. These are some of the best options for professional mechanics because of the superior performance. In fact, you can operate this tool one-handed. With that said, you are going to pay a lot more for a hydraulic brake flare tool.

Compact

Most hydraulic and compact flare tools are heavy and large. They aren’t best for flaring lines on all vehicle types. In these cases, you would do better with a compact model instead. With a compact flare tool, you get one opening for the lines, plus an interchangeable adapter. They are typically only compatible with certain vehicles and tubing diameters, so you wouldn’t want this option if you are doing multiple jobs.

Checking Brake Fluid Lines

If you aren’t sure it’s time to replace brake fluid lines, you need to perform a complete inspection. While it might take a little time to complete, here are the steps to follow.

  1. Check the rubber brake lines carefully for small pin holes or cracks.
  2. If no leakage is noted, look for abnormal bulges or chafing in the rubber material.
  3. If there is a blister on the surface, fluid has made its way out of the center tube and is pooling in the outer layer skin. This problem could cause a brake line to blow at any time.
  4. Inspect the connections, especially with any clamps. Make sure everything is secure.
  5. Once the engine is completely cool, you can gently squeeze the flexible sections of line. They should feel strong and firm. If they feel brittle or soft, you need to replace them. This problem indicates that the rubber is decaying within, leading to a higher chance of a rupture.
  6. Grab a friend for this section. Start the engine and pump the brakes. Watch the hoses to ensure they retain proper shape and size. If there is any shape-shifting or swelling, you should replace the line.
  7. Inspect the braided steel lines next. If you notice any sign of trauma or rust, you should replace them.
  8. Look over the metal tubes that run to the master cylinder. These can also become damaged, but it doesn’t happen as frequently. However, rust is common if you live in a high-humidity region.

Here’s a visual display of looking for bad brake hoses. Remember to replace any worn hoses right away, before more problems appear.

How to Flare Brake Lines

If you don’t know how to flare a brake line, the steps aren’t that complicated. Before you begin flaring a brake line, make sure you have the right equipment. Without the right model, you will have trouble getting the length and connections correct.

If you aren’t sure that you know what you are doing, we recommend using some scrap pieces first while you learn. Once you perfect the steps, you can move onto working with the real brake lines.

1. Prepare

Before you start, there is some critical work that must occur. Break apart the pipe unions. Spray the nipples one day in advance, so you are ready to go.

Take off the wheel before you clamp any loose pipes so there’s no leakage.

You also want to take off any rusted sections of brake pipe. You can utilize a simple ring spanner, which helps you get the nuts off. Now is a good time to replace those nuts, but don’t remove the brake lines yet. You will need them to cut the right length replacement.

Meanwhile, take inventory of all your tools. Here’s a complete list of equipment to have nearby.

  • Brake flaring tool
  • New brake line material
  • Brake fluid
  • Nut spanners
  • Vice

2. Cut Tubing

Cut your brake tubing to the right length with the help of a tubing cutter. Make sure there are no burrs located on the tube’s cut end. Slide the tubing nut onto the hex end of the tubing.

3. Insert Tubing

Loosen your wing nuts before you insert the brake tube into the clamp opening. Put the adapter size upside down away from the tube’s end. You can allow this to protrude to ensure the thickness matches.

Tighten the nuts securely. The tool halves should be parallel with each other while tightening the nuts.

Turn the adapter over and put some brake fluid on it. Insert this into your tubing.

4. Place the Flaring

Put the flaring on the tube’s clamp. The screw point lock must be centered just right so the flare is secure. While turning the screw clockwise, the adapter should bottom out of the clamp. Consider using a vice to clamp the tool for better tightening power.

5. Remove the Adapter

To take out the adapter, you must loosen the screw. Look for a bubble appearance at the tube’s end, which shows you are doing everything right.

Now, position your flaring tool, so the point goes through the end and is completely centered. Now, turn your screw again clockwise. You will tighten the screw until the cone bottoms out.

6. Inspect the Tubing

Take off the flaring tool and look at the end of your tube. The flare should be even around the end with no cracks or gaps. If so, you can remove the tube from the clamp.

7. Final Inspection

Once you have assembled the line, you must check it carefully for leakage.

If you are a visual learner, you will appreciate this video that teaches how to perform a brake line flare properly.

FAQ

Do brake lines need to be double flared?

According to automotive standards, brake lines must be double flared to handle the high pressure from the hydraulic system. The only time you would flare a single line is with a system that uses low pressure.

How do you bubble flare a brake line?

To do this properly, you want the best bubble flare tool. The kit should come with a pipe cutter, a yoke and a flaring bar. Set the tubing to the appropriate size and cut it. Insert the fittings into the flaring bar with the tube opening facing upward. Tighten the bar to keep the tube from moving. Then, place the flaring button into the tube’s open part. You will place the yoke on the bar, keeping everything completely straight. Tighten the button, but don’t put too much pressure on it. Remove the flare yoke and take out the button to inspect your bubble flare.

How Much Pressure Should Be In A Brake Line?

When stopping, the brake line pressure is likely less than 800 psi. However, when stomping hard on the brakes, it’s not uncommon to experience up to 2000 psi for full stopping power.

What is the most common brake line size?

As you look to find the best brake line material, you want to know what size is appropriate to use with your inverted flare tool. Most commonly, brake line sizes are 3/16-inch or 1/4-inch. The 3/16-inch brakes lines are most often on vehicles that have both drum and disc brakes, while the vehicles with all drum brakes sometimes contain 1/4-inch lines.

Conclusion

If you want to flare a brake line, you want the best tool on the market. After all, we are talking about working on the system that prevents you from getting into an accident. We’ve reviewed the top options, including heavy duty flaring tools for stainless steel tube, so you can find the equipment you need to get the job done.

Here’s a summary of our top 10 picks:

OTC 6502 Master Brake Flaring Tool Kit
  • Covers single double and bubble type flares
  • Single flare standard lines 3/16 inch - 5/8 inch and single flare metric lines 4 millimeters - 14 millimeters
  • Double flare standard lines 3/16 inch - 1/2 inch and double flare metric lines 4 millimeters - 10 millimeters
  • Bubble flare standard lines 3/16 inch - 1/2 inch and bubble flare metric lines 4.75 millimeters - 10 millimeters
  • Kit contains flaring bar, arbor press, adapters, tube cutter, and debarring tool - all in a hard case
Sale
Neiko 20657A ISO/Bubble Flaring Auto Tool Kit | 9 Piece | 4.75, 6, 8, 10 mm | For Car Mechanics, regular
  • [APPLICATION]: Make your own brake lines with the bubble Flaring I.S.O tool Kit, designed for metric soft steel brake lines requiring an "ISO" or bubble style flare for use on soft steel tubing used in automotive brake systems.
  • [EASY TO USE]: Lever-lock flaring bar makes tool kit easy to use for professional and DIY mechanics at the garage or at home.
  • [VERSATILE]: Suitable for foreign (Honda, Hyundai, Toyota, Subaru, etc) car manufacturers and domestic (Ford, Chevy, GMC, etc.) vehicles (cars, SUVs, light trucks).
  • [INCLUDES]: Yoke assembly, Flaring bar, Gauge/wrench, 10mm tubing, 4 adapters for 4.75mm, 6mm, 8mm for a complete bubble flaring tool set.
  • [CONVENIENCE]: Blow molded hard plastic storage case provides a convenient handle for easy travel and portability, and stores/organizes the kit for easy accessibility for your jobs on the go.
Sale
OTC 4503 Stinger Double Flaring Tool Kit
  • Designed to make double or single flares in copper, aluminum, and brass tubing as well as soft steel brake line tubing
  • Chrome plated alloy steel swivel reduces friction and helps ensure a smooth, even flare
  • Comprehensive set includes five adapters - 3/16, 1/4, 5/16, 3/8, and 1/2 inch (4.8, 6.4, 7.9, 9.5, and 12.7 mm)
  • Forged, heat-treated steel yoke for long term performance and durability
  • Rugged blow molded plastic storage case keeps tools contained and organized so they are ready when you need them
Neiko 20656A Auto Double Flaring Copper Aluminum Steel Brake Line and Brass Tubing Tool Kit | 9 Piece | 5 Adaptors | 4.8 mm – 12.7 mm | 3/16” – 1/2"" | For Car Mechanics or HVAC"
  • [APPLICATION]: Designed to use when flaring double or single flare in a variety of material: copper, aluminum, brass, magnesium, and soft steel brake line tubing for brake/fuel lines, HVAC and a variety of other applications.
  • [PRO GRADE]: Heavy duty design is forged from heat treated steel to ensure durability and strength to increase the service life and longevity of this brake line and tubing flaring tool set.
  • [DESIGN]: Alloy steel and chrome plated material is used to construct the swivel to assist in reducing friction for an easier task to execute professional looking jobs with brake line or transmission cooling line replacements, and more.
  • [INCLUDES]: Wide range of sizes: 5 adaptors- 4. 8mm through 12. 7mm (3/16, 1/4, 5/16, 3/8, 1/2").
  • [CONVENIENCE]: Blow molded hard plastic storage case provides a convenient handle for easy travel and portability, and stores/organizes the kit for easy accessibility for your jobs on the go.
OTC 6504 Deluxe ISO Bubble Flaring Tool Set with Cutter
  • Designed for metric steel brake lines where an ISO or bubble flare is required
  • Includes the number 6514 tubing cutter
  • Adapters for 4.75mm 6mm 8mm and 10mm tubing
  • Housed in a plastic blow-molded case
Shankly Flaring Tool Set (10 Piece - Professional Grade), Heavy Duty Steel Flaring Tools Kit and Swage Tool, Flaring Tool with Tubing Cutter Included. (This is not a Double Flaring Tool).
  • ALL INCLUSIVE KIT: Shankly’s flaring tool kit is all inclusive, complete with a professional a tubing cutter, allowing the mechanic to focus on the job rather search for parts. Please note: this is a standard flare tool, NOT a double flaring tool.
  • WIDE RANGE OF FLARE ADAPTERS: flaring tool adapters range from the following sizes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", making this the only flaring tool set a mechanic will need. (Metric: 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm)
  • COMMON SWAGE FITTINGS: Shankly flaring tools include five swage fittings and several useful tube sizes: 3/16”, 1/4”, 5/16”, 3/8”, 1/2”, 5/8”, creating a rugged and long lasting flaring tool, swaging tool kit.
  • PRECISE AND CONVERTIBLE: This flaring kit swivel-type swaging adapters and flaring cone are made of the sturdiest steel materials and chromed finished for easy operation and precision.
  • SELF-CENTERING YOKE: Shankly's brake line flaring tool includes two bars covering nine sizes with a self-centering, slip-on forged steel yoke to help form professional and quality flares and swages.
MASTERCOOL 72475-PRC Universal Hydraulic Flaring Tool Set with Tube Cutter, Blue and Silver
  • TUBE AND DIE SET STABILIZING ARM for easy tube forming
  • MAGNETIC ADAPTER holder keeps adapters in place
  • EQUIPPED WITH AN ENGLARGED DIE SET COMPRESSION AREA for better grip of dies
  • THIS TOOL CAN BE USED ON "annealed steel" & "dead soft"
  • INCLUDES dies and adapters to fabricate push connect 1/4, 5/16 and 3/8"; GM fuel line flare, brake lines and transmission 5/16 and 3/8"; flare/double flare 3/16, 1/4, 5/16, 3/8 and 1/2"; metric bubble flare 4.75, 6, 8, and 10mm, mini tube cutter for 1/8" to 5/8" (3 - 16 mm) O.D. tubing (1/8 to 1/2" nominal) all packaged in a custom blow molded case
Titan 51535 3/16-Inch Double Flaring Tool
  • Set Contents: (1) 3/16-Inch Double Flaring Tool with Removable Handle, (1) Positioning Bolt, (1) Double Ended OP1/OP2 Punch, (1) Container of Die Lubricant
  • Creates a perfect inverted 45-Degree SAE double flare with 3/16-inch steel and nickel-copper tubing. Not recommended for use on stainless steel tubing.
  • Can be used on the vehicle! Compact design can be used in tight under-car spaces allowing user to repair brake lines in place on the vehicle.
  • Handle can be removed if you prefer to use in a bench vise.
  • SAE Double Flare is an inverted 45-Degree flare typically used in automotive brake line applications. 3/16-Inch brake lines are on almost all cars and trucks making this flaring tool usable with most vehicles.
Sale
ABN Auto Double Flaring Copper Aluminum Soft Steel Brake Line and Brass Tubing Tool Kit
  • [Brake Line Flaring Made Easy]: To efficiently double or single flare in copper pipe, aluminum, brass, magnesium, and soft steel, use the ABN Brake Line Flaring Tool Kit
  • [Less Friction for Your Projects]: Excessive friction can cause stress and wear on tools and break tubing; Double flare tool kit includes swivel constructed out of alloy steel and chrome plated to reduce friction
  • [Built to Last]: Brake flaring tool kit forged from heat-treated steel; Double flaring tool kit will not crack or break under pressure after repeated, extended use
  • [Storage Case]: No need to worry about tube flaring tool kit getting lost in a toolbox drawer; Double flare tool package includes lightweight plastic blow-molded storage case for easy transportation and organization
  • [Package Contents]: Brake line flare kit includes adapter SAE sizes 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, 1/2-inch; Brake line flare tool package also includes flaring tools sizes 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, 1/2-inch
GEARWRENCH 12Pc. Tubing Service Set - 41590D
  • For Tubing Service
  • Broad Tubing Application Including Double Flare, Bend, Cut, Ream, and Deburr
  • Includes adapter sizes: 3/16 in 1/4 in 5/16 in 3/8 in 7/16 in 1/2 in 5/8 in
  • Included Mini tubing cutter, Tubing bender, Deburring tool, 7 piece flaring adapter kit, Holding bar, Yoke for flaring tool
  • Includes blow mold case for storage and organization