How to Repair an Auto Hydraulic Brake Line
- 1). Locate the damaged area of the hydraulic line. Starting at the master cylinder, follow each of the metal lines from beginning to end, looking for darkened or greasy spots. Ascertain which wheel is affected by the damaged line.
- 2). Starting under the hood, use the open-end flare wrench to loosen and remove the damaged brake line from the master cylinder. Use the floor jack to raise the affected wheel and remove it. Place the jack stand under the frame and carefully lower the vehicle until it is securely supported by the stand. Use the flare wrench to disconnect the line from the wheel caliper. Remove and discard the damaged line.
- 3). Install the new line. Maneuver it carefully into place; be careful not to damage or crimp the metal. Insert the threaded end into the caliper and tighten it with the flare wrench, taking care not to damage the threads. Attach the other end of the line to the master cylinder and tighten it.
- 4). Open the master cylinder reservoir and fill it with new brake fluid. Open the bleeder valve at the wheel caliper. Have an assistant pump the brake pedal repeatedly until all of the air in the system is purged. Tighten the bleeder valve, reinstall the wheel and remove the jack stand. Fill the master cylinder reservoir with brake fluid once more and replace the cover.
- 5). Test the brakes. Start the engine and press the brake pedal, checking for firmness. Drive the car and test the brakes several times, including at least one emergency stop. Bleed the brakes a second time if necessary.