GM Service Manual Online
For 1990-2009 cars only

Notice: Do not use fluid that has a petroleum base. Do not use a container that has been used for petroleum based fluids or is wet with water. Petroleum-based fluids cause swelling and distortion of rubber parts in the hydraulic brake system and water lowers the brake fluid's boiling point. Keep all fluid containers capped to prevent contamination.

The master cylinder reservoir must be kept properly filled. This is to insure an adequate fluid reserve as well as to prevent air from entering the hydraulic system. The reservoir must not be overfilled. Heat absorbed from the brakes and engine causes expansion of the fluid. The brake fluid reservoir is on the master cylinder and is located under the hood on the left side of the cowl.

  1. Clean the reservoir cap before removal to avoid contamination.
  2. Remove the master cylinder reservoir cap and the diaphragm .
  3. Add the fluid required to bring to the proper level. Do not fill above the maximum indicator level in the opening on top of the reservoir. The minimum level is any level which does not cause the fluid level sensor to turn on the BRAKE warning light.

Use Delco Supreme No. 11 Hydraulic Brake fluid or equivalent. Fluid must be DOT-3.