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

Notice: When adding fluid to the brake master cylinder reservoir, use only GM approved or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.

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

1. Place a shop towel under the brake master cylinder to catch any brake fluid loss.
2. Remove the brake master cylinder auxiliary reservoir. Refer to Brake Master Cylinder Auxiliary Reservoir Replacement .
3. Remove the brake fluid from the master cylinder primary reservoir. Discard the old fluid into an approved container.
4. Using 2 small flat-bladed screwdrivers, carefully release the primary reservoir retaining tabs (1) and begin to raise the reservoir.
5. Remove the reservoir from the master cylinder.
6. Remove the seals .

1. Inspect the reservoir for cracks or deformities. 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 and the reservoir bayonets with Saturn P/N 21013073, or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
5. Install the seals, making sure they are fully seated.
6. Install the reservoir onto the master cylinder. Press straight down by hand until the reservoir retaining tabs (1) lock over the retaining pin on the master cylinder.
7. Install the brake master cylinder auxiliary reservoir. Refer to Brake Master Cylinder Auxiliary Reservoir Replacement .
8. Fill the brake master cylinder auxiliary reservoir to the maximum-fill level with Saturn P/N 21013073, or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
9. Remove the shop towels and discard into an approved container.