H3 V8-5.3L (2008)
Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
4. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
5. Install a transparent hose over the end of the bleeder valve.
6. Submerge the open end of the transparent hose into a transparent container partially filled with brake and clutch fluid Super DOT-4, GM P/N
88958860 (Canadian P/N 88901244), or equivalent DOT-4 brake fluid from a clean, sealed brake fluid container.
7. Have an assistant turn the ignition ON, then partially apply and hold the brake pedal. DO NOT pump the brake pedal. Fluid will flow when the
bleed valves are opened.
8. Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
9. Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
10. Wait 15 seconds, then repeat steps 7-9 until all air is purged from the same wheel hydraulic circuit.
11. With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit,
install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
12. Install a transparent hose over the end of the bleeder valve, then repeat steps 6-10.
13. Turn the ignition OFF. The assistant will now have to pump the brake pedal for fluid to flow from open bleed valves.
14. With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the left rear hydraulic circuit, install a
proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
15. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
16. With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit,
install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
17. Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
18. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly
tightened.
19. Fill the brake master cylinder reservoir to the maximum-fill level with brake and clutch fluid Super DOT-4, GM P/N 88958860 (Canadian P/N
88901244), or equivalent DOT-4 brake fluid from a clean, sealed brake fluid container. Refer to Master Cylinder Reservoir Filling (with RPO
BRM) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Procedures/Master Cylinder Reservoir Filling (with RPO BRM)
)Master Cylinder Reservoir Filling (without RPO BRM) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Procedures/Master
Cylinder Reservoir Filling (without RPO BRM)) .
20. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
21. If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure,
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/Brake System External Leak Inspection) .
2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system.
22. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and
repaired.
23. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes (See: Hydraulic System/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Hydraulic Brakes) .
Hydraulic Brake System Bleeding (Pressure without RPO BRM)
Hydraulic Brake System Bleeding (Pressure without RPO BRM)
Special Tools
*
J 29532 Diaphragm Pressure Bleeder, or equivalent
*
J 35589-A Master Cylinder Bleeder Adapter
*
J 44894-A Brake Bleeder Adapter
Caution: Refer to Brake Fluid Irritant Caution (See: Service Precautions/Technician Safety Information/Brake Fluid Irritant Caution) .
Caution: Do not remove the reservoir cap while depressing and releasing the brake pedal. If the cap is removed while depressing and releasing the
brake pedal, pressurized brake fluid being returned to the reservoir may leave the reservoir. Personal injury or vehicle damage could result.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice (See: Service Precautions/Vehicle Damage Warnings/Brake Fluid
Effects on Paint and Electrical Components Notice) .
Notice: When adding fluid to the brake master cylinder reservoir, use only 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. The use of any type of fluid other than the recommended type of brake fluid,
may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.
Notice: Do Not allow the HBCi pump and motor to run more than 1 minute continuously. Allow 2 minutes cool down time between pump run times.
