Wheel Cylinder: Service and Repair
WHEEL CYLINDERS - DRUM BRAKEREMOVAL
NOTE: Before proceeding with this procedure, Refer to WARNING.
1. Using a brake pedal holder, depress the brake pedal past its first one inch of travel and hold it in this position (Fig. 134). This will isolate the master cylinder from the brake hydraulic system and will not allow the brake fluid to drain out of the master cylinder reservoir.
2. Raise the vehicle.
3. Remove the rear tire and wheel assembly.
4. Disconnect the rear brake flex hose from the wheel cylinder (Fig. 135).
5. Remove the rear brake drum.
6. Remove the rear brake shoes from the brake support plate.
NOTE: If the brake shoes are wet with grease or brake fluid, replace them.
7. Remove the brake wheel cylinder attaching bolts (Fig. 135).
8. Remove the brake wheel cylinder from the brake support plate (Fig. 136).
INSPECTION
With the brake drums removed, inspect the wheel cylinder boots for evidence of a brake fluid leak. Visually check the boots for cuts, tears, or heat cracks. If any of these conditions exist, the wheel cylinders should be completely cleaned, inspected and new parts installed.
If a wheel cylinder is leaking and the brake lining material is saturated with brake fluid, the brake shoes must be replaced.
INSTALLATION
NOTE: Before proceeding with this procedure, Refer to WARNING.
1. Install a new O-ring at the mating surface of the wheel cylinder-to-brake support plate (Fig. 136).
NOTE: When installing wheel cylinder on brake support plate, be sure it is positioned squarely (horizontal) to the brake assembly.
2. Install the wheel cylinder onto brake support plate (Fig. 136). Tighten the attaching bolts to a torque of 13 Nm (115 inch lbs.).
3. Hand start the rear brake flex hose tube fitting to wheel cylinder. Tighten the tube nut to a torque of 17 Nm (145 inch lbs.).
4. Install the rear brake shoes on the brake support plate. Replace them as necessary.
5. Install the rear brake drum onto the rear hub.
6. Install the tire and wheel assembly. Tighten the wheel mounting nuts to a torque of 135 Nm (100 ft. lbs.).
7. Adjust the rear brakes.
8. Lower the vehicle.
9. Remove the brake pedal holder.
10. Bleed the wheel cylinder as necessary.
11. Road test the vehicle to make sure the brakes operate correctly.