How to make a Double Flare on Brake Line

During the brake line flaring process, a flare is added to the end of the brake line to ensure no brake fluid leaks and the line doesn’t come off due to pressure. Brake lines require double flaring. Single Flares are only acceptable on low-pressure lines but not for high-pressure applications such as brake systems. Flaring makes the tubing wider at the end; it prevents the brake line from leaking or coming off. In this tutorial, we go over how to create double flares on brake lines.

1. Cut the brake line squarely. Clean the inside of the line tubing. Use a file to chamfer the edge of the  line.
2. Slide the flare nut over the brake line.
3. Insert the brake line in the hole that matches the diameter of the line.
4. Expose the pipe to match the thickness of the flare nut’s larger diameter.
5. Tighten the clamp bar.
6. Insert the flaring adapter into the brake line.
7. Use the flare yoke to press down on the flaring adapter.
8. Remove the flare adapter. Check there are no cracks on the brake line.
9. Use the tip of the flaring yoke (without an adapter) and tighten it to create a double flare.
10. Remove the flaring yoke and check the flare. If there are cracks present, redo the flare.

Preparing the brake line before flaring it is critical. Otherwise, it may crack. We hope you found this guide on How to make a Double Flare on a Brake Line helpful. Check these troubleshooting and repair guides for more help on your vehicle.

Can I use a single flare on brake lines?

Single flares are unacceptable for brake lines and tend to crack and leak quite easily.

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