Brake Fluid and Fluid Handling

Brake Fluid Precautions

^ Use only Delco Supreme 11 Brake Fluid GM P/N 12377967, or an equivalent DOT-3 brake fluid.
^ Do not use power steering or transmission fluid in the brake system.
^ Do not reuse brake fluid accumulated during brake system bleeding.
^ Always store brake fluid in a closed container. Reseal brake fluid containers immediately after use. Do not use brake fluid left in an open or improperly sealed container, because it absorbs moisture or can become contaminated.

Substandard or Contaminated Brake Fluid

Improper brake fluid, mineral oil (i.e., power steering fluid and transmission fluid) or water in the fluid may cause the fluid to boil, or the rubber components in the brake hydraulic system to deteriorate. If the master cylinder cap diaphragm is swollen, then rubber parts have deteriorated. This deterioration may also be evidenced by swollen wheel cylinder boots and caliper boots.

If deterioration of rubber parts due to substandard or contaminated brake fluid is evident, refer to "Brake Fluid" in the Testing and Inspection and follow the instructions given there.