How to make a Double Flare on Brake Line

Auto Service Genti • 2 October 2019
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During the brake line flaring process, a flare is added to the end of the brake line to ensure there will be no brake fluid leak and the brake line doesn't come off due to pressure.

Brake lines require double flaring. Single Flares are only acceptable on low-pressure lines, but not acceptable for high-pressure applications such as brake systems.

Brake line flaring tool

Flaring makes the tubing wider at the end, it prevents the brake line from leaking or comming off.

In this tutorial, we go over the steps on how to create double flares on brake lines.

  1. Cut the brake line squarley. Clean the inside of the brake line tubing. Use a file to chamfer the edge of the brake line.
  2. Slide the flare nut over the brake line.flare brake line nut

     

  3. Insert the brake line in the whole that matches the diameter of the brake line.brake line double flare tool

     

  4. Expose the pipe to match the thicknes of the flare nut larger diameter.how to make droulbe flare

     

  5. Tighten the clamp bar.
  6. Insert the flaring adapter into the brake line.brake line flare tip adapter

     

  7. Use the flare yoke to press down on the flaring adapter.create first brake line flare

     

  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 to create the double flare.how to create double flare brake line

     

  10. Remove the flaring yoke and check the flare. If there are cracks present, redo the flare.

It is very critical to prepare the brake line before flaring it. If you don't prepare the brake line it may crack.

We hope that you found this guide on how to double flare brake line tool useful.

Can I use single flare on brake lines?

Single flares are not acceptable for brake lines and tend to crack and leak quite easily.

1998-2007 (1st gen)