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

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

1. Remove the master cylinder from the vehicle. Refer to Master Cylinder Replacement .
2. Secure the master cylinder in a vise. Do not clamp the master cylinder body, secure only at the flange.
3. Using needle nose pliers, carefully depress the retaining tabs on the end of the brake fluid level sensor (1), and press the sensor through the reservoir (2) to remove.



4. Carefully tap out the reservoir retaining pins.
5. Remove the reservoir from the from the master cylinder by pulling the reservoir straight up and away from the cylinder.
6. Remove the seals from the master cylinder.

1. Inspect the reservoir (1) for cracks or deformation. If found, replace the reservoir.
2. Clean the reservoir with denatured alcohol, or equivalent.
3. Dry the reservoir with non-lubricated, filtered air.
4. Lubricate the new seals (2) and outer surface area of the reservoir-to-housing barrels with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT 3 brake fluid from a clean, sealed brake fluid container.
5. Install the lubricated seals (2), make sure they fully seated.
6. Install the reservoir (1) to the master cylinder, by pressing the reservoir straight down on the master cylinder until the pin holes are aligned.



7. Carefully tap the reservoir retaining pins into place to secure the reservoir.
8. Place the brake fluid level sensor into the reservoir, press into place to secure the sensor retaining tabs.
9. Remove the master cylinder from the vise.
10. Install the master cylinder to the vehicle. Refer to Master Cylinder Replacement .