Inspection Procedure
- Install the J 28662 to the brake pedal. See Special Tools .
- Start the engine and allow it to idle. Ensure that the wheels are directed straight ahead.
- Apply and maintain the brakes with 111 N.m (25 lb) of force to the brake pedal, as indicated on the J 28662 . See Special Tools . Observe for noises.
- Quickly release the brakes. Observe for noises.
- Check the pump and motor are running. If the noise is excessive/abnormal, check the following:
- Damaged high pressure pipe
- Defective pump and motor mounts
- Defective pump and motor assembly
- Apply the brakes with 178 N.m (40 lb) of force to the brake pedal, as indicated on the J 28662 , then gradually increase pedal effort up to 445 N. See Special Tools .m (100 lb) of force for not more than 5 seconds at a time. Observe for noises.
- Quickly release the brakes. Observe for noises.
- If a hiss noise was apparent and increased during the brake system increasing apply of 178-445 N.m (40-100 lb) of force, the hydraulic brake booster assist system is operating normally from an audible standpoint.
- If a clunk, chatter, and/or clicking noise was apparent during the quick release of the brakes following the brake system increasing apply of 178-445 N.m (40-100 lb) of force, the hydraulic brake booster assist system is operating normally from an audible standpoint.
IMPORTANT:
Do NOT apply 445 N.m (100 lb) of force or more to the brake system pedal for more than 5 seconds at a time.