For 1990-2009 cars

### Removal Procedure

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. Remove the underhood electrical center bracket. Refer to Underhood Electrical Center or Junction Block Bracket Replacement .
2. Remove the brake fluid from the reservoir. Discard the fluid into an approved container.
3. Disconnect the brake fluid level sensor electrical connector.
4. Remove the brake fluid level indicator switch. Refer to Brake Fluid Level Indicator Switch Replacement .
5. Remove the master cylinder reservoir attachment pins and discard the pins.
6. Release the reservoir from the master cylinder by carefully pulling reservoir straight up.
7. Remove the reservoir seals from the master cylinder body.

### Installation Procedure

1. Install the reservoir seals to the master cylinder body.
2. Install the reservoir to the master cylinder body by pushing the reservoir bayonets straight down into the seals in the master cylinder body.
3. Install NEW reservoir attachment pins. Ensure that the attachment pins are fully and firmly seated.
4. Install the brake fluid level indicator switch. Refer to Brake Fluid Level Indicator Switch Replacement .
5. Connect the brake fluid level sensor electrical connector.
6. Install the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Bracket Replacement .
7. Fill the master cylinder reservoir. Refer to Master Cylinder Reservoir Filling .
8. Bleed the brake system. Refer to Hydraulic Brake System Bleeding .