Avalanche 4WD V8-5.3L (2011)
Hydraulic Brake Booster: Service and Repair
Power Brake Booster Replacement
Warning: Refer to Brake Fluid Irritant Warning See: Service Precautions/Technician Safety Information/Brake Fluid Irritant Warning.
Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution See: Service Precautions/Vehicle Damage Warnings/Brake Fluid
Effects on Paint and Electrical Components Caution.
Caution: Hydraulic brake systems use two distinct and incompatible fluids. Power steering fluid is used in the hydraulic brake booster system. Brake
fluid is used in the master cylinder and brake pipes. Use extreme care when selecting brake system fluids, or seal damage can result. Refer to General
Information to select the correct fluid.
Checking and Adding Fluid
For information on checking and adding fluid to the hydraulic booster system, refer to Checking and Adding Power Steering Fluid .
Bleeding the Hydraulic Booster System
Refer to Power Steering System Bleeding See: Steering and Suspension/Steering/Power Steering/Power Steering Bleeding/Service and Repair.
Flushing the Hydraulic Booster System
Refer to Power Steering System Flushing See: Steering and Suspension/Steering/Service and Repair/Procedures/Power Steering System Flushing.
Removal Procedure
1. Apply the park brake and block the wheels.
2. Disconnect the inlet hose, the steering gear, and the return hoses from the booster assembly.
Note: DO NOT remove the pipes from the master cylinder.
3. Remove the master cylinder to hydraulic booster nuts and set the master cylinder aside in the engine compartment.
4. Remove the stop lamp switch. Refer to Stop Lamp Switch Replacement .
5. Remove the 4 booster to bulkhead nuts.
6. Remove the booster assembly.
7. Remove the gasket.
Installation Procedure
