H2 V8-6.2L (2008)
Brake Master Cylinder: Procedures
Master Cylinder Reservoir Filling
Caution: Refer to Brake Fluid Irritant Caution (See: Service Precautions/Technician Safety Information/Brake Fluid Irritant Caution) .
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: 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) .
Important: Before checking the HB-Ci Master Cylinder Reservoir brake fluid level, the accumulator fluid reserve must be drained. With the
ignition OFF, wait 15 seconds then depress and release the brake pedal 20 times to deplete accumulator reserve. Failure to drain the
accumulator prior to checking the brake fluid level can lead to system over filling.
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 filled to the maximum-fill level.
4. If brake system service was just completed, the brake fluid may be filled 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.
