Wheel Cylinder Replacement

Removal Procedure
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Remove the tires and the wheels. Refer to Tire and Wheel Removal and Installation.

Caution: Keep fingers away from rear brake shoe springs to prevent fingers from being pinched between spring and shoe web or spring and backing plate.

Notice: Do not pry against the splash shield or backing plate in attempt to free the drum. This will bend the splash shield or backing plate. A bent backing plate may cause brake chatter and/or pulsation.

Notice: Do not over stretch the adjuster spring. Damage can occur if the spring is over stretched.





3. Clean the dirt and foreign material around the following components:
^ The wheel cylinder inlet (3)
^ The pilot
^ The bleeder valve (1)

4. Remove the brake shoes. Refer to Brake Shoe Replacement. Remove the bleeder valve.
5. Remove the brake pipe inlet tube nut and the brake line.
6. Plug the opening in the line in order to prevent brake fluid loss and contamination.
7. Remove the wheel cylinder mounting bolts.
8. Remove the wheel cylinder.
9. Clean the old sealant from the backing plate where the wheel cylinder was installed.
10. Clean the sealant from the wheel cylinder if the cylinder is to be reused.

Installation Procedure
1. Apply Loctite (R) GM P/N 12345382 or equivalent to the wheel cylinder shoulder face that contacts the backing plate.





2. Position the wheel cylinder (3) and hold the wheel cylinder in place.

Notice: Refer to Fastener Notice in Service Precautions.

3. Install the wheel cylinder mounting bolts (2).
^ Tighten the wheel cylinder mounting bolts to 12 Nm (110 inch lbs.).
4. Install the brake pipe inlet tube nut.
^ Tighten the nut to 17 Nm (12 ft. lbs.).
5. Install the bleeder valve (1).
^ Tighten the valve to 7 Nm (62 inch lbs.).
6. Bleed the wheel cylinder. Refer to Hydraulic Brake System Bleeding.
7. Install the brake shoes. Refer to Brake Shoe Replacement.
8. Install the tires and the wheels. Refer to Tire and Wheel Removal and Installation.
9. Lower the vehicle.