How to Form Brake Line Ends

The process of forming the end of brake line tubing is known as flaring. In use, a threaded flare nut compresses the end of the flared brake line with the beveled seat inside a hydraulic fitting to provide a leak-proof, pressure resistant connection. The do-it-yourself vehicle owner can properly form the ends of brake line tubing with the use of a flaring kit. The time from set-up to completion is 20 minutes or less with a few additional tools.

Instructions

1

Cut the brake line to the length necessary for the specific application using the circular tubing cutter.

2

Clear the opening of the cut end of burrs with the tapered reamer. Turn the reamer slowly and in one direction only. Take care not to use excessive pressure as this may reduce the wall thickness of the tubing.

3

Place the threaded flare nut over the end of the brake line to be formed. Make sure that the threaded end is facing towards the end of the tubing.

4

Loosen both die clamps of the flaring block.

5

Insert the tubing into the proper size hole in the flaring block. Position the tubing so that the end is level with the upper surface of the die. Tighten the die block clamps firmly to avoid slippage during the forming process.

6

Apply a small amount of brake fluid onto the end of the tubing surface with a brush to reduce friction between the tubing and the flaring anvil. The anvil is beveled to a point and enters uniformly to make contact with the inner wall of the tubing.

7

Place the die block with the tubing into the bench vise. Tighten securely.

8

Attach the anvil frame onto the die block with the beveled anvil centered over the open end of the brake line tubing.

9

Slowly start tightening the anvil by turning in a clockwise direction until the point has entered the end of the tubing and has made uniform contact with the inner walls.

10

Check the die block clamps to make certain they are tight and holding the brake line tubing firm.

11

Apply brake fluid around the area of the anvil where it meets the edges of the brake line.

12

Slowly turn the anvil half a turn and stop. Turn the anvil counterclockwise to back it off to check the flaring progress. Continue in this manner until the outer edge of the brake line meets the seat of the die. Do not apply pressure beyond this point.

13

Loosen the anvil and remove it from the die block.

14

Inspect the formed end of the brake line for cracks or splits.

15

Loosen the die clamps and remove the brake line.