Chevrolet Silverado / GMC Sierra. Service manual — part 2378

Fig. 8: Master Cylinder Reservoir Retaining Pins
Courtesy of GENERAL MOTORS CORP.

1. Apply the park brake and block the wheels.

2. Remove the master cylinder. Refer to Master Cylinder Replacement (JD9, JF3, JF7) or

Master Cylinder Replacement (JH6, JH7).

3. Drain the master cylinder reservoir.

4. Secure the master cylinder in a vise. Do not clamp the master cylinder body, secure only at

the flange.

5. Remove the brake fluid level sensor by carefully depressing the retaining tabs and pushing

the sensor through the reservoir.

6. Carefully remove the reservoir retaining pins.

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 9: Reservoir & Master Cylinder
Courtesy of GENERAL MOTORS CORP.

7. Remove the reservoir from the master cylinder by pulling the reservoir straight up and away

from the cylinder.

8. Remove the seals from the master cylinder.

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Installation Procedure

Fig. 10: Reservoir & Master Cylinder
Courtesy of GENERAL MOTORS CORP.

1. Inspect the reservoir for cracks or deformation. If found, replace the reservoir.

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

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 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. Ensure that they are fully seated.

6. Install the reservoir to the master cylinder by pressing the reservoir straight down on the

master cylinder until the pin holes are aligned.

Fig. 11: Master Cylinder Reservoir Retaining Pins
Courtesy of GENERAL MOTORS CORP.

7. Carefully install the reservoir retaining pins to secure the reservoir.

2008 Chevrolet Silverado 1500

2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado