Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.

Caution: Refer to Brake Fluid Irritant Caution in the Preface section.

1. Remove the brake master cylinder assembly. Refer to Master Cylinder Replacement .
2. Drain the brake fluid from the reservoir.

Notice: Do not clamp on the master cylinder body. Doing so may damage the master cylinder.

3. Clamp the flange of the master cylinder body in a vise.



4. Remove the retaining pins for the brake master cylinder reservoir.



5. Remove the reservoir from the brake master cylinder.



6. Remove the seals from the brake master cylinder.
7. Clean the master cylinder area with denatured alcohol, or equivalent.
8. Dry the master cylinder with non-lubricated, filtered air.

1. Lubricate the new seals and the outer surface area of the reservoir-- to-- housing barrels with Delco Supreme 11® (GM P/N 12377967) or equivalent DOT-3 bake fluid from a clean, sealed brake fluid container.
2. Install the lubricated seals, make sure that the seals are fully seated in the brake master cylinder.




Important: When performing the following service procedure, apply equal pressure to ensure proper seating of the reservoir and the pin holes are aligned.

3. Install the reservoir to the brake master cylinder.



4. Install the reservoir retaining pins.



5. Remove the brake master cylinder from the vise.
6. Install the brake master cylinder. Refer to Master Cylinder Replacement