12 Best Brake Line Flaring Tools in 2024

The brake line flaring tool is a worthy investment in the long run and will make a huge difference in your car. I have dealt with automotive for a long, and I know the problems people face when looking for flaring tools. One can use flaring tools for both professional and personal purposes. I have also dealt with so many automotive accessories and products, so I have depth knowledge and experienced perspective when it comes to flaring tools. Before you buy the best brake line flaring tool, consider your specific requirements and how the tool can satisfy them.

I will give you some recommendations for the best flaring tools you can use based on my experience. The brake line flaring tools are easy to handle, and they will make your work much easier. You will not be required to project much prowess in the tool since it is already efficient on its own. The brake line flaring tools can be used for several purposes, which include fitting brakes, transmission lines, cooling, fuel, and other automotive purposes.

Best Overall
Mastercool 72475-PRC...
Best Value
Titan - 3/16 Double...
Best Choice
OTC 6502 Master Brake...
Mastercool 72475-PRC...
Titan - 3/16 Double...
OTC 6502 Master Brake...
Amazon Prime
Amazon Prime
11.83 pounds
14.2 ounces
0.078 ounces
15 x 10.6 x 3.5 inches
2 x 5.1 x 9.1 inches
9.3 x 12 x 2.9 inches
Universal Hydraulic Flaring Tool Set with Tube Cutter
51535 3/16-Inch Double Flaring Tool
Best Overall
Mastercool 72475-PRC...
Mastercool 72475-PRC...
11.83 pounds
15 x 10.6 x 3.5 inches
Universal Hydraulic Flaring Tool Set with Tube Cutter
Best Value
Titan - 3/16 Double...
Titan - 3/16 Double...
Amazon Prime
14.2 ounces
2 x 5.1 x 9.1 inches
51535 3/16-Inch Double Flaring Tool
Best Choice
OTC 6502 Master Brake...
OTC 6502 Master Brake...
Amazon Prime
0.078 ounces
9.3 x 12 x 2.9 inches

best brake line flaring tools

How to Use a Brake Line Flaring Tool

Anyone doing their automotive repairs should have a brake line flaring tool set. Without the tools, it is quite difficult and almost impossible to find the right length of steel length. It is very crucial to know how to use the brake line flaring tool. These steps will guide you through the process:


Before you begin the process of flaring your brake line, break the pipe unions and squirt the nipples a day before. You also need to prepare yourself with some brake fluid. Ensure that all your tools and nut spanners are ready, and check if you will require any metric or imperial tools.

Remove the road wheel and clamp any loose pipes to prevent leakage. Ensure that there is a movement of the bleeding nipple. If it doesn’t move or it has breakage, then it’s high time you prepare for a replacement.

Snap off the old rusted brake pipes and use the ring spanner to remove the nuts. Replace the nuts, but keep the old brake pipes to cut the replacement to the right length.

Using the Flaring Tools

Step 1: Use the cut the tubing to your desired length using the tubing cutter. Get rid of any burrs on the cut end of the tube and slide the tubing nut on the hex end of the tube first.

Step 2: Loosen the wing nuts and insert the tube in the appropriate opening of the tubing clamp. Place the right adapter size upside down from the end of the tube, which is protruding. Let the end of the tubing protrude from the tube so that it matches the thickness of the adapter’s larger part. Tighten the nuts of the wings tightly. Ensure that the tool’s halves are parallel to one another as you tighten the nuts.

Step 3: Turn over the adapter, coat it with a little amount of brake fluid, and then insert it into the tube.

Step 4: On the tubing clamp, place it on the flaring. Make sure to center the screw point and lock the flaring toll to the tubing clamp. Turn the screw clockwise until the adapter bottoms out from the tubing clamp. The final tightening is quite easy if you clamp the tool in a vice.

Step 5: Loosen the screw to remove the adapter. The end of the tubing should have a bubble look at this stage.

Step 6: Position the brake line flaring tool with the point going through the tubing end and centered. Turn the screw in a clockwise direction and tighten it till the cone is completely bottomed out.

Step 7: Remove the brake line flaring tool and inspect the end of the tubing. Ensure the flare is even all around without any gaps or cracks. End by removing the tubing from the clamp.

Step 8: After the final assembly, check carefully if there is any leakage. It would be prudent to do some experiments using scrap pieces of the brake pipe to gain confidence.

The things you require for this process to be a success are a brake flaring tool, tubing cutter, and brake fluid. You are advised to always check for new flare cracks. Never use the flare if you find any cracks on it. The proper flare will be even and centered on the opening of the brake fitting. The quality of the flare you choose will determine how well the fitting will connect to the brake line to whichever part of the brake you will be attaching to.

Brake Line Flaring Tools Lists

1. OTC 6502 Master Brake Flaring Tool Kit

The OTC master brake flaring tool will make the process of repairing your brake line quite comfortable. The OTC 6502 kit covers different types of flares, including bubble, double and single flares. It comes along with other tools you will need for a perfect finish, such as adapters, a tube cutter, an arbor press, a flaring bar, and deburring tool. All these items come in a durable and strong hard case. The kit is portable since it only weighs 4 pounds. It is an awesome addition to your collection of tools, and its aesthetics will match your other tools.

  • Covers both bubble and single flares
  • Single metric flares range from 4mm- 14mm, and single flare standard lines range from 3/16-5/8 inches.
  • Double flare metric lines 4mm-10mm and Double flare standard lines 3/16-1/2 inches
  • Bubble flare metric limes 4.75mm to 10mm and Bubble flare standard lines 3/16 to ½ inches.
  • Kits come with a debarring tool, tube cutter, adapters, arbor press, and flaring bar

2. OTC 4503 Stinger Double Flaring Tool Kit

The stinger double flaring tool kit allows for both double and single cutting. This is one of the best double-flaring tools you will get. The swivel and yoke are of high quality. They are made of heat-treated steel, making them more durable. The yoke has the right hole to fit the size of the brake line. This yoke is split into two halves screwed together with a pair of wing nuts. The swivel slides at the back of the yoke easily and can be positioned to drive the adapter into the end of the brake line much easier.

The OTC stinger kit does have not only a fantastic fit but also an excellent finish. This kit comes in an awesomely made plastic case for easy portability and storage. The tool can work for any type of car since it is also able to flare copper aluminum soft steel brake lines.

  • Designed for single and double flares in aluminum, copper, soft steel, and brass brake line tubing
  • Heat-treated forged steel yoke for durability
  • Set has five adapters 3/16, ¼, 5/16, 3/8 and ½
  • Chrome-plated alloy steel swivel to reduce friction
  • Blow-molded rugged plastic storage

3. OTC 6504 Deluxe ISO Bubble Flaring Tool 

The OTC 6504 flaring set makes high-quality flares and is also easy to use. It is ideal for metric steel brakes, a line that requires a bubble or ISO flares. The set comes with adapters of sizes 4.75mm, 6mm, 8mm, and 10mm. It also comes with a No. 6514 tubing cutter. All these come in a plastic blow-molded case which makes transportation much better and easier.

  • Adapters of sizes 4.75mm, 6mm, 8mm, and 10mm tubing
  • 6514 tubing cutter
  • Ideal for steel brake lines
  • Suitable for bubble and ISO flares

4. Neiko 20657A ISO/Bubble Flaring Tool Kit

The Neiko 20657A of 9 pieces comes in a blow-molded case. You can use it on metric soft steel brake lines where the bubble-style flare is needed. It comes with four adapters of 10 mm, 8mm, 6mm, and 4.75mm tubing, a wrench/gauge, a flaring bar, and a yoke assembly. The brake line flaring tool is ideal for both domestic and foreign vehicles. It is easy to use the kit for both DIY and professional mechanics. The blow-molded case makes it easy to organize and carry around.

  • Designed for Metric soft brake lines, which need bubble or ISO-style flare
  • Flaring bar, yoke assembly, and Wrench/Gauge for 10mm tubing
  • 4 adapters of sizes 8mm, 6mm, and 4.75mm
  • Lever lock flaring bar for easy usage
  • Blow-molded packaging for proper storage and organizing

5. Neiko 20656A Auto Double Flaring Copper

Neiko 20656A is a perfect kit for anyone looking for a single and double flaring tool. It is suitable for use on various materials such as soft steel, magnesium, brass, and aluminum brake lining tubing. This kit is made from durable steel, and thus it is ideal to be used on heavy-duty materials. It is suitable for use in applications that may cause a lot of friction since it is made of alloy steel and chrome-plated steel. All the tools in this kit come in a hard plastic storage case which is portable and convenient for transportation.

  • Designed for single and double flares
  • Used in soft steel, magnesium, brass, aluminum, and copper brake line tubing
  • 5 adapters of sizes 3/16, ¼, 5/16, 3/8, and ½.
  • Swivel made with chrome and steel-plated material for reduced friction
  • Heavy-duty design made from heat-treated steel for durability
  • The blow-molded case for convenient handling and portability

6. Shankly Flaring Tool Set

The best thing about the Shankly flaring toolset is that it is convertible and precise. The flaring cone and swaging adapters of this set are made with sturdy steel materials and a chrome finish for precision and easy operation.  The Shankly flaring tool kit contains several useful tubes and five swage fittings, creating a long-lasting and rugged flaring tool kit.

The tubes are of sizes 5/8, ½, 3/8, 5/16, ¼, and 3/16. It also comes from a wide range of flaring adapters which range from 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, and 16mm. The Shankly brake line flaring tool features two bars that cover nine sizes.

It has a slip-on self-centering yoke made of steel, forming quality and professional swages and flares. It is a standard flare toolset with ten pieces and not a double flaring tool. The set also comes along with a tubing cutter. It is an ideal choice for professionals since it is all-inclusive.

  • It is a Standard tool
  • Flare adapters of sizes 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, and 16mm
  • 5 swage fittings for 3/16, ¼, 5/16, 3/8, ½, and 5/8 tube sizes
  • Made with steel materials and chrome finish for precision and easy operation
  • Steel forged self–centering yoke

7. Shankly 9 Piece Flare Tool

Shankly’s nine-piece flaring tool contains all the tools you require to do flaring jobs either as a DIY or as a professional. It contains flare adapters of different sizes, standard swage fittings, a self-centering toke, and a professional tubing cutter.

These materials are made of steel and are, therefore, reliable and durable. The Shankly double flaring tool kit can be used for different applications since they operate with high precision and accuracy. All nine pieces in this tool kit will inevitably produce high-quality flares.

  • It’s a standard flaring tool
  • 6 adapters of sizes 5/8, ½, 3/8, 5/16, ¼ and 3/16
  • Precise and convertible
  • Have two bars with a self-centering yoke

8. Shankly Flaring Tool Kit 7 Piece Tool Set

This tool kit contains components made with a chrome finish and sturdy steel materials. The set is complete and unique. It comes along with tubing adapters of sizes 14mm, 12mm, 10mm, 8mm, and 6mm, four spring blenders of sizes 6mm, 8mm, 10mm, and 12 mm, and a tube cuter of 3-28mm.

All these contents come in a hardy traveling case. This brake line flaring tool set comes with everything you will need for the job starting from tubing cutter to spring benders. This tool is, however, not a double-flaring tool but a standard flaring tool. This brake line flaring tool has two bars that cover several sizes with a self-centering, slip-on forged steel yoke to assist in the formation of quality flares.

  • An all-inclusive kit with spring benders and tubing cutter
  • Tubing adapters ranging from size 3/16, ¼, 5/16, 3/8, ½ and 5/8
  • Tube cutter for 3mm to 28 mm
  • 4 spring benders of sizes 6mm, 8mm, 10mm, and 12 mm
  • Two tube bars with a self-centering yoke


Mastercool 70058 is a complete kit with a “Deburring” tool, a cutter, and a plastic box. It has an automatic toque release and is lightweight, thus easily portable. This Mastercool manufactured kit is designed with aluminum making it stable and durable. The “deburring” tool is ideal for making both propane and NG flares. This Mastercool flaring tool makes smooth and even flares. However, it is suitable for HVAC and not recommended for automotive.

  • Automatic torque release
  • Durable and lightweight
  • Aluminum design
  • Have a steel exterior
  • Included a tube cutter and deburring tool
  • Housed in a plastic box

10. MASTERCOOL 72475

This brake flaring has various features and adjustments, which result in great-quality in flaring. The kit comes along with different sizes of push connect, metric flares, transmission flares, brake lines, and GM line flares. This remarkable tool works on both dead soft and annealed steel.

You can use the mini cutter for sizes from 1/8 to 5/8. This flaring tool has easy and simple adjustments. The MASTERCOOL kit is ideal for both industrial and residential purposes. You can use the kit for both bubble and double flaring.

This tool is designed with quality materials, and it will serve you for a long. It features an enlarged die set which increases its grip quality. It features a super magnetic adapter that keeps it in the right position.

  • Include 70027 mini cutters for 3mm-16mm tube sizes
  • It can be used on dead soft and annealed steel
  • Has an enlarged die set compression
  • Magnetic adapters that keep adapters in their perfect place
  • Die and tube set stabilizing arm, which makes tube forming easy

11. Titan Tools 51535 Double Flaring Tool

The Titan brake line flaring tool is indispensable when it comes to repairing brake lines for vehicles. It has a user-friendly design and comes with detailed instructions which can help you create perfect double flares. The compact construction of this flaring tool makes it ideal to use in automotive.

With this tool, you do not have to remove the brake line from your vehicle to repair it since you can do it when everything is still in place. The tool kit contains a positioning bolt, die lubricant, double-ended op1/op2 punch, and a flaring tool. This flaring tool is, however, not recommended to use on stainless steel tubing.

  • Creates perfect inverted 45-degree flares best for automotive brake line applications
  • Includes 1 container of die lubricant, 1 double-ended OP1 /OP2 punch, and I positioning bolt
  • The flaring tool has a removable handle
  • You can remove the handle and use the tool in a bench vise
  • Compact design allowing It to be used when brake lines are still in place

12. ABN Auto Double Flaring Tool Kit

Auto Body New Manufacturers have been producing premium automobile products for a long time. Their tool kit is suitable for both brass tubing and brake lines. The tool can be used for both double and single flares and is made with reliable auto-line tools.

This brake line flaring kit by ABN promises to make perfect flares without any leaks. The toolset contains flaring tools and adapters ranging from 3/16 to ½. The tools are mainly designed for tubing and replacement jobs.

Its yoke is made from heat-treated steel, which makes it more robust and durable. The best thing about this brake line flaring set is its lightweight which makes transportation and portability easy.

  • The steel swivel is chrome-plated for reduced friction
  • It can be used for brass tubing and aluminum soft steel brake lines
  • Heat-treated forged yoke for increased strength and durability
  • 5 adapters of sizes 1/2, 3/8, 5,16, ¼ and 3/16
  • Tools are safely and securely stored in a blow-molded case

Things to Consider Before Buying Brake Line Flaring Tool

You may be excited to buy your first brake line flaring tool, but it is crucial to take your time. Make sure that you know the features of the flaring set to see if it will meet your needs. Below are some of the things you should look at before you buy a brake flaring tool:


A brake line flaring tool should always be leak-proof since if it leaks; then it will have no meaning. The material used to make the flaring toll will determine if it will have leakages or not. Consider a flaring tool made of durable and thick fittings to make sure that corrosive materials will not leak at all.


This is an essential thing to consider since the toolset should meet your needs. The best flaring tool should be efficient. It should be ideal for the usage of in-car applications. Ensure that the brake flaring tool you buy is well compatible with your vehicle and, more especially, the brake parts.

Brake System

The brake system is one of the most vital parts of your vehicle, and it’s where you will be using the flaring tool. Ensure that you are conversant with the fittings, pipes, and parts of your brake system as well as how it works. With this information, it will be very easy for you to get the right brake flaring tool. Do a thorough vial inspection of your brake system to have a foresight of the size of cuts you will make.

Flaring Tools Adapters

Different flaring tool kits will come with several adapters. The adapters assist one in piecing together the tricky sections of your piping. It will be prudent to buy the adapters together with the flaring tool rather than buying them individually. It will prevent you from buying the wrong adapters, which may not be compatible with the flaring tool.

Durable Material

Make sure that you buy a flaring tool that has withstood the test of time. It should be made with long-lasting materials that will withstand years of application. A durable tool does not necessarily have to be heavy. Manufacturers are now able to transform durable materials into something light and portable. Metal steel materials have started making waves in the market again.


The double-flaring tools have made the process of fitting pipes efficient and straightforward. The three main components of a flaring tool include a metal piece, the crew, and the metal bar. These three components have to be present as a brake line flaring tool for maximum efficiency. The most efficient flaring tool is the one that can form tight fittings, and that is a major thing you should consider during the purchasing process.


Single flaring tools are much cheaper compared to double flare sets. However, if you want a flare kit to use for heavy-duty applications, it is crucial to invest in a long-lasting tool kit. As much as you want a tool kit that fits your budget, do not compromise the quality of the price.

best brake line double flaring tool
best double flare tool

Frequently Asked Questions(FAQs)

How to Bubble Flare Brake Line?

For you to bubble flare a brake line, you need a bubble flaring kit. The kit should have adapters with the yoke, the flaring bar, and the pipe cutter. With this kit, you can make a single flare, double flare, and bubble flare. Set the tubing to the size that you want in the pipe cutter. Rotate as you tighten the knob on the outer side, and repeat till you cut the tubing.

Insert the brake line fittings correctly in the flaring bar. The opening of the tubing should be facing up towards the flat part of the flaring bar. Insert the tubing into the correct size of the hole in the flaring bar. For the 3/16 brake line tubing, the end should be up to about ¼ from the edge of the flaring bar.

Tighten the flaring bar to prevent the tube from moving. Put the flaring button into the opened part of the tubing. Put the flaring yoke onto the bar to wine up the tubing. Ensure the button and the attachment is perfectly straight. If it gets crooked, then the bubble flare will come out crooked, which will cause a brake line leak.

Tighten the flaring button going downwards using the flaring yoke but do not overtighten. When you feel that it is down tight, do not squeeze further. Remove the flaring yoke and take the button out. Loosen the flaring bar, and you will have the bubble flare.

Do Brake Lines Need To Be Double Flared?

A double flare is one of the most popular flares you will get in vehicles. Here you will be forming the end of the line twice when folding the lip of the single flare over. The double flare is similar to the single flare, but it is much more acceptable and stronger for the high pressure in a brake system. It is not advisable to use single flares for brake lines since they tend to crack and leak much more easily. Double flares are the best to use in brake lines. They are mainly in US-manufactured cars in the ’80s.

Are Brake Line Compression Fittings Safe?

Though compression fittings are considered to be more reliable than threaded fittings, they have several shortcomings. Compression fittings are not as resistant to vibration as welded or soldered fittings. If you bend the fittings repeatedly, it may make the ferrule lose its hold on the tube.

How Much Pressure Should Be In A Brake Line?

Metal brake lines can withstand as much as 5000 psi tests. Most of the brake lines, however, burst around 15,000 psi. The full lock operating pressures of brake systems in the conventional OEM style automotive is 900 to 100 psi, the 69 bar manual brakes. The 96-bar power-assisted brakes can go beyond 1,400 psi.

How Do Flare Fittings Seal?

Put oil on the threads so that when you seal, there will be less friction on the threads. Threads do not seal but are just tightened down with the nuts. The oil should make it easier for the nuts to turn easier for the threads and seal it with the flare.

best bubble flare tool
best bubble flare tool


Pipes are the backbone of any construction project. They hold things together and act as a foundation of a bigger structure. The foundation should be concrete and stable since if it falls; then the entire thing will crumble. It is, therefore, vital to fit the pipes together, and the best brake line flaring tool will make you make adjustments. A brake flaring tool will make the pipes more pliable so that they can fit well with the next session.

Looking for a brake line flaring tool does not have to be a tedious process. This review will make it easy for you to know the features of the top flaring tools and see which matches your preference and needs. Both a hobbyist and a professional can use the flaring tools discussed above. One can also use flaring tools in non-automotive industries.

It would be more prudent to choose a double flare kit since you can use it for both single flaring and double flaring. Also, make sure that the materials making the tools will fit the application you tend to use it for. Consider stainless steel flaring tools for brake lines in cars. Ensure that you know how to use the flaring tools, especially when dealing with projects related to automotive.

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Hi there, I am R. Hasan Tito, a mechanic, and owner of this website. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). I worked as a Mechanic and Mechanic Supervisor for over fifteen years at Global Rebound Automotive companies - Toyota, TATA, BMW, Nissan, TVs, and Others. Now, I enjoy my new role of leading a team of automotive experts (in their respective fields) and publish new content on a regular basis on my website and social media.

2 thoughts on “12 Best Brake Line Flaring Tools in 2024

  1. Thank You So Much Mike For Your Feed Back. Keep in touch we are always committed to giving better information to all of our beloved fans

  2. I was looking for Brake Line Flaring Tools all in one or separate but couldnt decide what to get. But this article had both pros and cons, and it helped me to get the one I can afford and use it for long term use. Author man, Thanks a lot for doing all the searching for me and provide me with the best ones. The article really helped me out. God bless you and keep the HELPFULL articles like this coming for us, so that we have a better idea at tools and other stuff (price included) .

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