How to Make a Double Flare Brake Line End

The brake system in your vehicle is made up of many different components. Almost all of these components connect to each other via brake lines, which carry the brake fluid from one place to another. To prevent leaks, these brake lines have a double flared end which allows the fitting to properly seal against the adjacent fitting. Making these flares can be a bit daunting at first and requires some special tools. If you're restoring a car or just installing new brake lines, the first step is to double flare your brake line ends.

Instructions

1

Cut the brake line tubing using the brake line cutting tool. Use the inner/outer reamer to deburr the inside and outside of the cut end. This will ensure that the flares turn out as clean as possible.

2

File the cut end of the brake line square and flat using a file and polish up the end around the cut using the emery cloth. Open the flaring tool and locate the number on the tool that matches the diameter of your brake line tubing. Push the end of the brake line into the flaring tool so that the end of the tubing sticks up as far as the step on the tool indicating the size of tubing.

3

Insert the tubing adapter that comes with the flaring tool into the center of the brake line using your hands. Install the flaring tool over the tubing adapter, then tighten down the flaring tool until the tubing adapter bottoms out. Loosen the flaring tool by hand and remove the tubing adapter from the tube.

4

Reinstall the flaring tool over the brake line by hand and to tighten down the flaring tool until it bottoms out. Loosen the flaring tool and remove it from the brake line.