GM Service Manual Online
For 1990-2009 cars only

Caution: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:

   • Eye contact--rinse thoroughly with water.
   • Skin contact--wash with soap and water.
   • If ingested--consult a physician immediately.

Notice: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid from contacting these areas. Always re-seal and wipe off brake fluid containers to prevent spills.

Notice: Use only DOT-3 brake fluid from a clean, sealed container. Do not use any fluid from a container which is wet with water. Do not use DOT-5 silicone brake fluid. Improper brake fluid, mineral oil, or water in the fluid may cause the brake fluid to boil, or the rubber components to deteriorate. Keep all fluid containers capped to prevent contamination.

The master cylinder reservoir must be kept properly filled to insure adequate reserve, and to prevent air and moisture from entering the hydraulic system. Because of expansion due to heat absorbed from the brakes and the engine, do not overfill the reservoir. Do not add fluid if the brake hydraulic system is not leaking.

The master cylinder reservoir is part of the master cylinder assembly. The master cylinder assembly is located under the hood on the drivers side of the vehicle.

  1. Thoroughly clean the master cylinder reservoir cover before removal in order to avoid getting dirt into reservoir.

  2. Object Number: 385195  Size: SH
  3. Remove the cover and the diaphragm.
  4. Add fluid as required in order to bring level to 20-26 mm (0.78-1.0 in) (1) below the filler neck inside the reservoir. Use Delco Supreme No. II Hydraulic Brake Fluid (GM P/N 12377967) or equivalent DOT-3 motor vehicle brake fluid.