Brake Fluid Reservoir: Service and Repair

Master Cylinder Reservoir Replacement

Removal Procedure
Warning: Refer to Brake Fluid Irritant Warning (Brake Fluid Irritant Warning).


Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution (Vehicle Damage Warnings).

1. Using a suitable tool, remove the brake fluid from the brake master cylinder reservoir.
2. Discard the brake fluid into an approved container.




3. Disconnect the master cylinder fluid level sensor electrical connector (1).
4. Remove and discard the master cylinder reservoir retaining pins (2) by compressing the locking tabs.




5. Carefully remove the master cylinder reservoir (1) by pulling the reservoir straight up.




6. Remove the master cylinder reservoir seals (1).

Installation Procedure

1. Lubricate the master cylinder reservoir seals with GM approved brake fluid from a clean, sealed brake fluid container.




2. Install the master cylinder reservoir seals (1).




3. Install the master cylinder reservoir (1) to the master cylinder.
4. Ensure the master cylinder reservoir bayonets are fully seated in the master cylinder.




5. Connect the master cylinder fluid level sensor electrical connector (1).
6. Install new master cylinder reservoir retaining pins (2).
7. Ensure the retaining pins are fully seated and the locking tabs are fully deployed.
8. Fill the master cylinder reservoir to the proper level. Refer to Master Cylinder Reservoir Filling (Master Cylinder Reservoir Filling).
9. Observe the brake pedal feel after filling the master cylinder reservoir. If the pedal feels spongy, bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Manual) (Hydraulic Brake System Bleeding (Manual))Hydraulic Brake System Bleeding (Pressure) (Hydraulic Brake System Bleeding (Pressure)).