How to Flare Brake Lines?

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The perfectly flared brake lines keep you away from leakage. When the brake lines are not properly flared, there might be too much leakage that can result in brake-fails and severe accidents.

However, it is annoying to go to the mechanic every time! The easy thing is learning how to flare brake lines to save money from additional sealant usage and keep the car safe.

Today, we have come up with two easy methods of flaring brake lines. Have a look at them and do it yourself!

Methods of Flaring Brake Lines

Before you get in, you must know that there are two methods of flaring the lines. In the first method, we have mentioned the Generating Brake Line Flaring Tool. Then, we will discuss the method of Double Flaring Tool brake lines.

Step 1: Measure the Brake Line

First of all, you have to make sure that you are wearing proper protection for your hands and eyes.

Get gloves for your hands and eyeglasses so that you can safeguard your body. Now, you have to get your hands on a measuring tape and measure the length of the brake line you are dealing with,

Step 2: Cut the Tubing

After you have measured the brake lines, you have to move to cut the braking tubing. You cannot work with the whole length.

You will need a tubing cutter for the process. If you don’t get one, you can also rely on a hacksaw. Cut the desired length first and remember that while cutting, you cannot cause burrs.

When you use a hacksaw, you have to remove the burrs manually. Now that you are done with the tube cutting process, you have to form the tubing’s flare.

In this case, you will need a flaring tool. You can also use a double flare tool for the work.

Method 1: Generating Tool

Step 1: Make the Connection Firm

You have already been through the preparation process. Now, we will tell you how to flare brake lines.

First, you have to put the cone part of the tool at the end of the flared tubing. Get your hands on the CONE and get it down.

At a moment, you will see that it is centered over the end of the tube. Here, you have to move the cone.

Remember, the tube’s flared part should stay firm against the countersunk recess of the bar. For moving the cone, you need to turn the advance screw first.

Step 2: Check the Tubing

After you are done, you have to check the flare properly. There can be cracks and splits. No matter what imperfection there is, you have to look for it before you get done with the flare.

If you find any sort of imperfection, you must keep in mind that you cannot work with the same tubing anymore. In this situation, you have to rely on a new piece of tubing.

Cut a new tubing piece and use it the same way we have explained above. And again check if there are any imperfections or not.

Method 2: Double Flaring Tool

Step 1: Clamp the Tubing

First of all, you have to clamp the tubing perfectly so that it doesn’t move much. Before that, certify that the depth of the tubing must be equal to the edge of the tubing size insert. Now, clamp the tubing into the flaring bar carefully.

Step 2: Install the Yoke

After you are done with the clamping process, you can get your hands on the yoke. You have to install the yoke now.

This will help in advancing the cone into the tube till you get the desired bell shape. For this, you have to remove the insert first.

Then, you can get the cone into the bell. With the help of the bell-shaped tube, you will get flares of double thickness! That’s the reason it is called Double Flaring Tubing.

Common Mistakes while Flaring Brake Lines

Uneven Lines

The most common mistake when it comes to flaring brake lines is the uneven line. You might think that uneven lines are not a problem but trust us; they are! The best thing you can get for cutting the lines is a tubing cutter.

We do not recommend hacksaw unless you have no option. Even if you use a hacksaw, making the line even to prevent fluid from leaking is necessary.

The Imperfect Stick-Out

If you are worried about over-flared or buckled-flare, you have to go for an adequate amount of “stick-out.”

You must keep in mind that the line will be flush with the edge of the die so that it can make the flare. If you are using a pro-flaring tool, you can settle for “operation 0” so that you get the right stick-out of the line,

Additional Burrs and Debris

If you are using freshly cut lines, there can be burrs. In some cases cutting debris can harm the process too.

When these are there, the additional materials get inside the flare while forming forcibly. As a result, you will face inconsistent flare.

In this case, there are 90% chances of flare leaking. The best way to stop it is to deburr the lines. You can use the files that are usually added with the tubing cutters kits.

Cleaning the line is necessary and for this, you must try to use Aerosol Injection. It will make sure that the line is clean before you flare the line.

Another amazing trick is to get some spray lines and add them to the end of the line. This will stop flare leakage and from it easily.


Now you have learned how to flare brake lines at home without making any sort of mistake! All you have to do is get the right flaring kits and keep them in handy.

Use them whenever you need, flare the brake lines, and forget about the leaks! Don’t forget to share your ideas for flaring brake lines. Comment below about your secret tricks!

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