Bubble Flare VS Double Flare: Whice Is Better

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“Bubble flare vs double flare” is a common but controversial topic to explore. Do you know which one is suitable for you?

Bubble flare and double flares are flaring tools we would discuss to find out which one works best for you and if they meet your requirements.

The right brake line flare is a crucial element that should not be overlooked.

To get an efficient and satisfying brake function and performance, using a good flared brake line should be achieved.

Brake lines are critical components of the braking system.

A flared brake line would ensure that the metal lines are spread out to fit together seamlessly and meet smoothly with another metal line segment.

This precaution is taken to ensure that the lines are in good condition. The damage would lead to fluid loss and would result in brake failure. 

We are reviewing the bubble flare and double flare to understand the characteristics of these tools.

Bubble Flare VS Double Flare: Top 6 Bubble/Double/Single Flaring Tools Review 2022

The flare is one of the most vital parts of the braking system as it helps to prevent broken lines or loss of fluid by helping to keep a tight seal on it. The most common flare types are,

  • Bubble flare
  • Double flare 
  • Single flare

The choice of flare chosen and wielded depends on the model of the car that you are using. 

Now, it’s important to note that when choosing a flare for a vehicle, a bubble or double flare should be considered instead of a single flare.

The single flare would be unable to endure the braking system’s tremendous pressure. 

01. TGR Professional Double Brake Flares


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The first on the list of top six bubble double flares is the TGR professional brake flaring tool. This comes with a set of single, bubble, and double flares. 

Highlighted Features

  • Easy to operate
  • Has dies for “1/4”, “3/16”, 3/8, and 5/6 tubing 
  • Stability
  • Compatible with steel, stainless steel, and soft metal tubing
  • Creates bubble, double and single flares
  • T-hand screw clamp 

This particular flaring set creates single flares, bubble flares, or double flares on 4 varied sizes of tubing.

When you think of flaring your brake and you want a flawless flare in the fuel lines, transmission cooler lines, and brake lines, this is a tool you can rely on to help you with that.

Its compatibility with steel, soft metal, and stainless steel is remarkable.

When building brake lines, what is required is a rapid and easy-to-use tool that does not take a lot of time to operate and conclude.

This sure fits the criteria when you want to make the perfect flare.


  • Simple and brisk to use 
  • Do not put marks on tubes
  • Flares brake lines effortlessly
  • Stable result
  • Quick and precise flares 
  • Works great with steel, soft metal tubing, and stainless steel 


  • Might produce uneven flares 

02. K-Tool T-Handle International Brake Flaring Kit


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Highlighted Features

  • Steel (stainless)
  • Makes 45-degree bubbles, double and single flares
  • Works with lines with diameters of 3/6, 3/8, 1/4, and 5/16
  • Screw clamp, T-handle
  • The color is black

This bubble double flare will assist you in achieving your ideal flare. In stainless steel, soft metal, and steel, you can make a 45-degree bubble, single and double flare.

The K-tool features a turret-style construction that allows you to create a precise flare in a short amount of time, as well as a T-handle screw clamp that keeps the die in position when flaring.

Fuel, transmission cooler, and brake lines can all benefit from this.


  • Quick and simple to utilize
  • Allows for a clean and precise flare
  • It flares a tougher steel line
  • Invariably effective
  • Exceptional fit
  • Durable
  • An excellent connection that does not leak


  • If done incorrectly, it could result in a leak at the fitting
  • The pattern on the handle is poor

03. ABN 45 Degrees Professional Brake Line Flaring Tool Kit


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Highlighted Features

  • For 3/16, 1/4, 5/16, and 3/8 tubing
  • Makes single, double, and bubble flares 
  • T-handle screw clamp 
  • Plastic carrying case

ABN professional brake line flaring tool kit is an excellent tool to make use of to create good fitting flares on the brake lines.

It comes with a T-handle screw clamp that helps to hold the die and tube securely in place, which would in turn make the job easier and quicker.

It is easy to use the flaring tool and it does not require any complicated rules to follow in creating your desired flare.

It gives an excellent fitting flare to the brake lines which would give a leak-free connection.

This 45-degree set makes the double, bubble, and single flares on soft metal, stainless steel, and OE steel. 

ABN professional brake flaring tool is not meant to be used under the car. In the workshop, it should be employed on a hitch-mounted vice or a bench-mounted vice.


  • It is Durable 
  • Simple to use
  • High quality 
  • Gives good fitting double and bubble flares 
  • Flares quickly 


  • Cannot be used in the car

04. 4LIFETIMELINES Flaring Tool Compatible with Stainless Steel


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Highlighted Features

  • 5 tubing sizes
  • Compatible with nickel-copper tubing, steel, and stainless steel
  • T-handle clamp

4lifetimelines flaring tool comes with 5 tubing sizes which include, 1/4, 3/8, 3/16, and 5/16 which helps to create 45 degrees double, bubble, and single flares.

Your brake lines, transmission cooler lines, and fuel lines will all get perfect flares with this flaring tool.

It comes with an efficient T-handle clamp that keeps the die and tube in place, resulting in an easy, rapid, and satisfying working experience.

It has a Turret carrier that keeps your dies safe and ready for use


  • High-quality material 
  • Long-lasting 
  • Easy to use
  • Produces accurate brake line flares
  • It is time-saving


  • Tube crimping is misplaced due to a poor press base
  • Flaring stainless steel may be problematic

05. Eastwood Professional 45-Degree Bubble Brake Flaring Tool


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Highlighted Features

  • Works with soft metal tubing, OE steel, or stainless steel
  • Makes 45-degree bubble, double, and single brake flares
  • T-handle clamp for securing the die and tube

Flare your brake lines, gasoline lines, and transmission cooler lines with the Eastwood professional brake tube flaring tool.

It’s do-it-yourself, easy-to-install equipment that creates outstanding flares in five different sizes of tubing.

It includes bubble, double, and single flares to easily flare steel, soft metal, and stainless steel.

It includes a turret that allows you to create flares in a short length of time. The T-handle screw clamp maintains your line in place while shaping.


  • High quality 
  • Accurate double and bubble flares
  • Durable 
  • Simple and quick to use


  • Stainless steel may not operate correctly

06. ARES 18012 45 Degree Aluminum Tubing Brake Line Flaring Tool


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Highlighted Features

  • It can be used for flaring copper, steel, and stainless steel 
  • The die and tubing are held in position by a T-handle screw clamp
  • Made for vice-mounted use
  • Tube sizes include 1/4, 3/16, 3/8, and 5/16
  • Has double, single, and bubble flares

Ares professional brake line flaring allows you to construct a 45-degree bubble, single and double flare fast and easy.

It comes with four dies for tubes with diameters ranging from 3/16 to 3/8 inch.

A T-handle screw clamp is included to help you keep the die and tube in place.

Ares professional brake line flaring is the equipment to use when you need great flares for your stainless steel, copper aluminum brake line, steel, transmission cooler lines, and fuel lines tubing. 


  • Long-lasting 
  • Flares excellently in brass, copper, aluminum, and soft steel
  • a dependable and effective tool
  • Quick and easy to use


  • The tube cutter and clamp tool may be worn out
  • Working with stainless steel may prove challenging
  • Slack clamp

Bubble Flare VS Double Flare: Features & Specifications

What Are Double Flares?

As a car owner, you most likely have a hazy understanding of how your vehicle’s components function.

Or perhaps you only have a general understanding of what the parts are and how they function, but not in-depth information.

When you break down the parts and learn what they do and how they work, it’s a lot easier. This helps you understand how your vehicle operates and, hopefully, appreciate its value.

Brake flares come in a variety of shapes and sizes, so before you start flaring your brakes, it’s a good idea to brush up on the basics.

The function of the braking system is greatly influenced by flares. It allows the brakes to function properly.

The type and quality of brake flare you employ is an important consideration since what you choose can either prevent or encourage fluid leakage from your brake flare.

Do-it-yourself has been the standard in recent years, with many people preferring to stay at home and repair their own devices.

It’s crucial to recognize and comprehend the various flare kinds if you wish to do your flaring.

Double Flare

Because of its strength and dependability, the double flare line is still the most common.

It is more robust and sturdy, and it can withstand strong braking pressure. It resembles a funnel that has been placed into a tube.

This type appears inverted and is normally at a 45-degree angle. It is commonly seen in American or Asian cars. 

The double flare is also known as Inverted style flare and SAE. The end line of the double flare system is twice inserted into the vehicle’s braking system.

The single flare’s lip must remain folded on the system while doing so for the double flare to work. 

The double flare is more resistant to cracking and breaking than the single flare, which cracks and breaks easily under pressure.

Furthermore, there can be a lot of pressure inside a brake system that is too much for a single flare to handle. 

The braking mechanism uses a double flare with a female socket with an inner side.

If you use this flare line in the wrong socket, you won’t have a good seal. Leaking will occur if you do so.

If the socket at the end of your brake line matches, the double flare is the best option

A double flare tool can cost anywhere from $20 to $200, depending on its features.

What Are Dubble Flares?

Bubble Flare 

Bubble flare is widely used in European automobiles. It appears to be a button at the tubing’s end.

When viewed from the back, it forms a 90-degree angle with the tube section.

When the socket has a dip or a funnel-like shape heading inwards, bubble flares are employed in the brake line.

This flare type should never be used in a socket designed for double flare. You’ll end up with a leaking braking system which would cause your brakes to damage and fail.

Bubble flares are more durable and dependable than single flares, although they are not as strong as double flares.

They aren’t as strong as double flares and can’t withstand the same level of strain.

 The production of bubble flare brake lines is the initial step in the production of double flare brake lines.

So, a bubble flare braking line must be created first if a double flare is desired. The look of bubble flares is more akin to a screw’s head.

A bubble flare can also be created by combining double flares. For in-car brakes, double flares are preferable to bubble or single flares.

When the brake system tubing’s end resembles a button, however, a bubble flare can be used.

The cost of a bubble flare tool is between $20 and $150.

Bubble Flare vs Double Flare- Differences

It’s interesting to note that making the bubble flare comes first before creating double flares.

The SAE is the most prevalent of the double flare and bubble flares and may be found in Asian and American vehicles.

People sometimes confuse double flares with bubble flares; however, there are a few key distinctions between the two of them.

Before you start flaring your brake lines, it’s critical to understand the difference between a bubble and a double flare.


Double flare: The double flare has a funnel shape, and the surface appears to be a line pointing inward. It has a spherical appearance with a considerable thickness.

The last line will be inserted twice into the brake system with this type. To accomplish so, the double flare requires the single flare to be present in the system.

Bubble flare: The bubble flare is only distinguishable at the top, where it differs from the others.

The top has a screw shape, while the circular edge has a smaller diameter. A bulging hollow-topped flare is the most common description.

Bubble flare, also known as DIN or ISO, is frequently used in European automobiles. Making a double flare starts with this step. SAE can also be used to create bubble flares.

Ease of Creation

Double flares: Double flares are said to be easier. It’s the preferred style among do-it-yourselfers and workshop engineers. A large number of experts are well-versed in the procedure.

Bubble flares: The bubble flares, on the other hand, are extremely technical, and the method for generating them is completely different

Each product’s temperature

The operating temperatures for the double flare and the bubble flare are different. The temperature of the double lines is 45°C, while the temperature of the bubble flare is 37°C. 


The most frequent flare is the double flare, which may be found on many current cars.

It’s been there since the 1980s, particularly in American-made cars. Because the SAE performs effectively under pressure, it is simple to deal with this flare system.

Despite the fact that the bubble flare is frequently confused with the double flare, it is less popular.

The bubble flare became popular in the 1980s, primarily in Europe, but it is still less common and not as popular as SAE; it has a low level of usage and technical comprehension.

Inclined Top End’s Angle

This fits within the category of appearances, but it’s not the same. The top-end forms and proportions have a significant impact on how these flares perform.

The backside of the double flare is inclined at a 45-degree angle, making it a one-of-a-kind operating method. The bottom end of the bubble flare has a 90-degree slope.

Most Vital FAQs On Bubble Flare VS Double Flare

When making brake flares, what sort of oil should you use?

For producing flares on your brake lines, fuel lines, and transmission cooler lines, you can use any form of tool lubricant.

Can I get the double flare tools separately? 

Most flaring tools come with a set of Single flares, bubble flares, and double flares. 

Which is better? Bubble flares or double flares?

Bubble and double flares are both more powerful than single flares.

The most popular is SAE, which is seen largely in American and Asian vehicles, whereas bubble flare is mostly found in European vehicles.

Inverted flares outperform bubble flares in terms of strength, durability, and dependability. It can sustain extreme pressure for a longer time and in a better way than bubble flare.

What’s the best way to make Double flares?

Step 1: Before slashing, double-check your measurements and make sure the cutting tool is appropriately lined up and the flare equipment is securely clasped.

Step 2: This step is sometimes ignored, but it is crucial. You’ll need the right cutters and you’ll want to avoid any uneven edges.

Step 3: Fix up the brake flaring appliance. It contains two moving parts, and it takes a lot of pressure to keep the tool stable.

Step 4: Install the gear. Before flaring, you must prevent the hardware from slipping around needlessly.

Step 5: Using the tool, clamp the line. Here, proper alignment is essential.

Step 6: Apply lubricant to the line. This is accomplished with the use of brake fluid or grease. You should not lubricate this part using a lubricant that is silicon-based. 

Step 7: Make the line flare. Tighten the flaring tool using the fitting wrench.

Step 8: Flaring in two directions. It entails reiterating the procedures. Nonetheless, there are some discrepancies you should know about.

At this point, inserts are avoided, and screwing is stopped when resistance is detected. Make a third-quarter spin and check for a normal double flare of 45 degrees.

How do you create a bubble flare? 

Cut tube: It’s crucial to be cautious when cutting the tube, as utilizing a cut-off wheel is frequently a weak point that allows leaks to develop.

A leak could occur as soon as the connection is severed to flare. A crisp, clean cut is required. For the flare’s shape to be consistent.

Bubble flare: After the tubing has been cut to perfection, you’re ready to clamp it into the flare.

It’s a good idea to choose a die with a “DIN” mark on one end, as it has been proven that these dies are quite effective.

Downward half of the die mounting: Set the brake line to the lowest half of the die to confirm that the “DIN” end of the die is aligned with the verge of the brake line.

After that, hoist the top half of the die, crank the clasp down, inject the pin into the clamp, and tighten the clamp, so the die halves are snugly fastened together.

Use grease or copper anti-convulsants to lubricate the brake line.

Lubricating brake lines: Pull the lever on the flaring tool in one continuous movement once the line has been clamped and lubed.

After you’re done, clear up your tools and the automobile is ready to go.

Are the flares on the brake lines 37 degrees or 45 degrees?

In automotive hard lines, including brake, gasoline, and transmission fluid transfer, the 45-degree inverted flare is the most prevalent flare design.


The battle between bubble flare vs double flare has raged on for a while as car owners are wondering which is more beneficial to their braking system.

However, car specialists use both flaring tools. The SAE double flare, on the other hand, is the most commonly utilized brake line flare.

It’s also known as the inverted flare and is an upgraded variant of the single flare.

As a car owner, understanding the fundamental differences between bubble flare and double flare is critical.

The flare is one of the most valuable aspects of a vehicle’s braking system.

The braking system of a vehicle is, once again, probably the most important component of your vehicle.

As a result, having a complete understanding of the flaring systems will undoubtedly assist you in self-maintaining your vehicle.

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