Sierra 3500 Denali 2WD V8-6.0L (2011)
install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
20. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
21. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly
tightened.
22. Close the J-29532 - Diaphragm Pressure Bleeder, or equivalent , fluid tank valve, then disconnect the J-29532 - Diaphragm Pressure Bleeder,
or equivalent , from the J-35589-A - Brake Pressure Bleeder Adapter.
23. Remove the J-35589-A - Brake Pressure Bleeder Adapter from the brake master cylinder reservoir.
24. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
25. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
26. If the brake pedal feels spongy perform the following steps:
1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection (See: Hydraulic System/Testing and
Inspection/Component Tests and General Diagnostics).
2. Using a scan tool, perform the antilock brake system automated bleeding procedure to remove any air that may have been trapped in the brake
pressure modulator valve (BPMV).
27. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Note: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
28. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes.
