Notice: When filling the master cylinder, use only Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid. Do not use a container which has been used for petroleum based fluids, or a container which is wet with water. Petroleum based fluids will cause swelling and distortion of rubber parts in the hydraulic brake system, and water will mix with brake fluid, lowering the boiling point. Keep all fluid containers capped to prevent contamination.

Keep the master cylinder brake fluid reservoir properly filled to ensure an adequate reserve and to prevent air and moisture from entering the hydraulic system. However, adding brake fluid is not usually necessary unless the brake system has a leak, indicated by the brake warning lamp coming on due to low brake fluid, or the system is being serviced. Because of the fluid expansion due to heat absorbed from the brakes and the engine the reservoir must not be overfilled.

The brake fluid level will become lower as the brake pads wear and should return to approximately the full level when new pads are installed. If brake fluid has been added to the reservoir prior to a pad change, the fluid level should be checked and may be over full.

To fill the reservoir, thoroughly clean around the reservoir cap before removing it to avoid getting dirt or other contaiminates into the reservoir. Remove the cap and add fluid as needed to bring the level to the full mark. Use only Delco® Supreme II Brake Fluid (GM P/N 12377967) or an equivalent DOT 3 brake fluid.