Silverado 1500 4WD V8-6.2L (2010)
Hydraulic Brake Booster Pump: Service and Repair
Power Brake Booster Pump Fluid Accumulator Replacement (Non-Hybrid)
Special Tools
J-26889 - Accumulator Piston Compressor
Removal Procedure
Warning
The accumulator contains compressed gas. Always use the proper tools and follow the recommended procedures or personal injury may result. Do not
apply heat to accumulator. Do not attempt to repair an inoperative accumulator. Always 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.
Warning
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.
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 (Vacuum Assist) (See: Hydraulic System/Brake
Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement)Master Cylinder Replacement (Two-Mode Hybrid)
(See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement)Master Cylinder
Replacement (Hydraulic Assist) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder
Replacement).
4. Place the J-26889 - Accumulator Piston Compressor over the end of the accumulator.
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.
