For 1990-2009 cars

### Removal Procedure

1. Disconnect the electrical connector from the fluid level sensor (2).
2. Drain the brake fluid from the master cylinder reservoir.
3. Remove the brake pipes from the master cylinder (4).
4. Plug the open pipes to prevent fluid loss and contamination.
5. Remove the two attaching nuts (3).
6. Remove the master cylinder (5).
7. Remove the reservoir, if it is to be used on the replacement master cylinder. Refer to Master Cylinder Reservoir Replacement .

### Installation Procedure

1. Install the reservoir onto the master cylinder, as needed. Refer to Master Cylinder Reservoir Replacement .
2. Install the master cylinder (5) onto the power booster (1).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the attaching nuts (3).

Tighten
Tighten the nuts to 27 N·m (20 lb ft).

4. Install the brake pipes (4).

Tighten
Tighten the brake pipe fittings to 15 N·m (11 lb ft).

5. Fill the master cylinder reservoir to the full level mark using only Delco Supreme II (GM P/N 12377967) Brake Fluid, or equivalent DOT-3 brake fluid.
6. Connect the electrical connector to the fluid level sensor (2).
7. Bleed the hydraulic system. Refer to General Brakes.
8. Recheck the fluid level in the reservoir.