Chevrolet Silverado / GMC Sierra. Service manual — part 2393

1. Apply the park brake and block the wheels.

2. Depress brake pedal at least 10 times in order to relieve pressure in the accumulator.

3. Remove the master cylinder from the hydraulic booster. Refer to Master Cylinder

Replacement (JD9, JF3, JF7) or Master Cylinder Replacement (JH6, JH7).

Fig. 41: View Of Accumulator With C-Clamp
Courtesy of GENERAL MOTORS CORP.

4. Place the J 26889 over the end of the accumulator. See Special Tools.

replace an inoperative accumulator with a new one. Dispose
of an inoperative accumulator by drilling a 1.5 mm (1/16 in)
diameter hole through the end of the accumulator can,
opposite the O-ring.

CAUTION: Push rod removal is not recommended. Improper staking of

the push rod to the Hydroboost reaction piston can result in a
loss of brakes. If the rod or seals require service, the entire
unit must be replaced.

2008 Chevrolet Silverado 1500

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

5. Install the nut on the stud.

6. Depress the accumulator with a C-clamp. If the accumulator does not move with moderate

pressure, remove the C-clamp and depress the brake pedal ten times in order to relieve
pressure in the accumulator.

Fig. 42: Identifying Brake Booster Retaining Ring & Access Hole
Courtesy of GENERAL MOTORS CORP.

7. Rotate the retaining ring (2) until either end of the ring is under the access hole (1).

8. Depress and hold the retaining ring (2) with a small tool inserted into the access hole (1).

2008 Chevrolet Silverado 1500

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

Fig. 43: Identifying Accumulator Components
Courtesy of GENERAL MOTORS CORP.

9. Remove the accumulator retainer ring (1) using a small hook shaped tool.

2008 Chevrolet Silverado 1500

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

Fig. 44: View Of Accumulator With C-Clamp
Courtesy of GENERAL MOTORS CORP.

10. Release the C-clamp.

11. Remove the nut from the stud.

12. Remove the J 26889 . See Special Tools.

2008 Chevrolet Silverado 1500

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