Wheel Cylinder Replacement

REMOVAL PROCEDURE





1. Raise and support the vehicle.
2. Remove the tire and wheel assembly.

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 chaffer 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 and linings.
5. Remove the brake hose inlet fitting bolt and discard the copper washers. Plug the opening in the hose in order to prevent brake fluid loss and contamination.
6. Remove the wheel cylinder mounting bolts.
7. Remove the wheel cylinder.
8. Clean the old sealant from the backing plate where the wheel cylinder was installed.

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 20 Nm (115 ft. lbs.).
4. Install the brake hose and inlet fitting bolt using new copper washers.
^ Tighten the nut to 50 Nm (37 ft. lbs.).
5. Install the bleeder valve (1).
^ Tighten the bleeder valve to 13 Nm (115 inch lbs.).
6. Bleed the wheel cylinder.
7. Install the shoes and linings.
8. Install the tire and wheel assembly.
9. Lower the vehicle.