Instructions for Pipe Flaring Tools

Updated July 19, 2017

Learning to properly use a flaring tool isn't hard, and once you know how to use this tool, you will wonder how you ever got along without it. These tools make the bell-shaped end of many of the metal tubes, like brake lines, in cars and trucks. Never again will you be forced to use random lengths of brake tubing to repair a rusted brake line, a transmission cooling line or any other tubing repair. With a flaring tool, you can buy bulk tubing and make your own custom-length flared tubing.

How to Use a Flaring Tool

Flaring tools are described as either single or double flare. Both work the same way, but the double makes a stronger, safer flare. The single flare is a one-step operation and forms a flare from a single layer of the tube, while the double first forms a bulged out area in the end of the tube, which is folded over itself to make a double-layered flare during the second step. The largest part of a flaring tool is the tube clamp. This clamps has several holes, which are marked for the various tube sizes. Loosen the wing nuts to allow the tube clamp to open and insert the tube into the proper-sized hole. Set the small flaring adaptor--this is the small disk with the stud protruding from one side of it--upside down beside the end of the tube and adjust the tube to stick out of the clamp the same distance as the thickness of the adaptor disk. Tighten the wing nuts securely. If they are loose, the tube will slide in the clamp and ruin the flare. Attach the flaring screw to the clamp. It attaches by sliding down over the clamp and twisting sideways to hold it in place. The cone on the end of the flaring screw should line up with the end of the tube. Place the protruding end of the adaptor disk inside the tube, using brake fluid as a lubricant. Tighten the screw against the back of the disk until the disk is pressed against the sides of the clamp and then back the screw off and remove the adaptor disk. Add another drop of brake fluid to the end of the tube and tighten the cone of the flaring screw into the end of the tube until it stops. Loosen and remove the clamping screw and set it aside. Loosen the wing nuts and remove the tube from the clamp. Examine the flare. It should be uniform and without any cracks.

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About the Author

K.K. Lowell is a freelance writer who has been writing professionally since June 2008, with articles appearing on various websites. A mechanic and truck driver for more than 40 years, Lowell is able to write knowledgeably on many automotive and mechanical subjects. He is currently pursuing a degree in English.