Silverado 1500 2WD V8-6.0L Hybrid (2009)
Brake Master Cylinder: Procedures
Master Cylinder Replacement (RHD)
Master Cylinder Reservoir Filling (Non-Hybrid)
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) .
1. Visually inspect the brake fluid level through the brake master cylinder reservoir.
2. If the brake fluid level is at or below the half-full point during routine fluid checks, the brake system should be inspected for wear and possible
brake fluid leaks.
3. If the brake fluid level is at or below the half-full point during routine fluid checks, and an inspection of the brake system did not reveal wear or
brake fluid leaks, the brake fluid may be topped-off up to the maximum-fill level.
4. If brake system service was just completed, the brake fluid may be topped-off up to the maximum-fill level.
5. If the brake fluid level is above the half-full point, adding brake fluid is not recommended under normal conditions.
6. If brake fluid is to be added to the master cylinder reservoir, clean the outside of the reservoir on and around the reservoir cap prior to removing
the cap and diaphragm. 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.
Master Cylinder Replacement (Vacuum Boost)
Master Cylinder Reservoir Filling (Two-mode Hybrid)
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) .
Important: The ignition must be in the OFF position, without pausing at ACCESSORY, and without applying the brake pedal to ensure
the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1 to 3 minutes.
1. Turn the ignition to OFF, without pausing at ACCESSORY, and remove the ignition key.
Important: During the pressure relief process, the fluid level in the master cylinder reservoir will rise. Do not remove the master cylinder
reservoir cap during the pressure relief process.
2. Wait approximately 1 to 3 minutes until the brake modulator and HPA pressure relief is complete.
3. Visually inspect the brake fluid level through the brake master cylinder reservoir.
4. The brake fluid level should rise to the upper full fill level mark (1) after the brake fluid level stabilizes.
5. If the brake fluid level is below or rises above the upper fill level mark after the brake fluid level stabilizes, the brake system should be inspected.
