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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1322 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> Hydraulic Brake Assist System Noise Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the J 28662  to the brake pedal. See Special Tools .
  2. Start the engine and allow it to idle. Ensure that the wheels are directed straight ahead.
  3. Apply and maintain the brakes with 111 N (25 lb) of force to the brake pedal, as indicated on the J 28662  . See Special Tools . Observe for noises.
  4. Quickly release the brakes. Observe for noises.
  5. If chatter and/or a vibration of the brake pedal was apparent during the brake system apply of 111 N (25 lb) of force, the power steering pump drive belt not may have proper tension or may be excessively worn.
  6. If any significant noise was apparent during the quick release of the brakes following the brake system apply of 111 N (25 lb) of force, there is likely a restriction in the hydraulic brake booster power steering return hose.
    7. IMPORTANT: Do NOT apply 445 N (100 lb) of force or more to the brake system pedal for more than 5 seconds at a time.
  7. Apply the brakes with 178 N (40 lb) of force to the brake pedal, as indicated on the J 28662  , then gradually increase pedal effort up to 445 N (100 lb) of force for not more than 5 seconds at a time. See Special Tools . Observe for noises.
  8. Quickly release the brakes. Observe for noises.
  9. If a hiss noise was apparent and increased during the brake system increasing apply of 178-445 N (40-100 lb) of force, the hydraulic brake booster assist system is operating normally from an audible standpoint.
  10. 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 (40-100 lb) of force, the hydraulic brake booster assist system is operating normally from an audible standpoint.
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