REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Raise and safely support the vehicle.
- Remove the wheel and tire assembly.
- Unfasten the inlet brake fluid line, then cap the line to prevent contamination from entering.
- Remove the brake shoes and hardware to allow the wheel cylinder to be removed from the backing plate.
- To remove the round retainer type cylinders, insert two awls or pins into the access slots between the wheel cylinder pilot and the retainer locking tabs. Bend both tabs away simultaneously. The wheel cylinder can be removed, as the retainer is released.
- To remove the bolted wheel cylinders, unfasten the wheel cylinder bolts using a #6 Torx bit, then remove the cylinder from the backing plate.
- Apply a very thin coating of silicone sealer to the cylinder mounting surface. This will help to prevent corrosion buildup between the cylinder and the backing plate.
- For round retainer type wheel cylinders, position the cylinder and hold it in place with a wooden block between the cylinder and the axle flange. Carefully seat the new retainer clip, using a 1 1 /8 in. 12-point socket and socket extension (to help preserve your fingers). The socket is used to assure that the retainer seats evenly.
- For bolt type wheel cylinders, position, install the cylinder to the backing plate, and fasten the attaching bolts. Tighten to 15 ft. lbs. (20 Nm).
- Install the brake shoes and related hardware to the backing plate.
- Uncap, then connect the brake line to the wheel cylinder. Tighten the inlet tube nut to 17 ft. lbs. (23 Nm).
- Install the wheel.
- Carefully lower the vehicle. Torque the lug nuts to the proper specification.
- Properly bleed the hydraulic brake system.
See Figures 4 through 13
Wheel cylinder overhaul kits may be available, but often at little or no savings over a reconditioned wheel cylinder. It often makes sense with these components to substitute a new or reconditioned part instead of attempting an overhaul.
If no replacement is available, or you would prefer to overhaul your wheel cylinders, the following procedure may be used. When rebuilding and installing wheel cylinders, avoid getting any contaminants into the system. Always use clean, new, high quality brake fluid. If dirty or improper fluid has been used, it will be necessary to drain the entire system, flush the system with proper brake fluid, replace all rubber components, then refill and bleed the system.
- Remove the wheel cylinder from the vehicle and place on a clean workbench.
- First remove and discard the old rubber boots, then withdraw the pistons. Piston cylinders are equipped with seals and a spring assembly, all located behind the pistons in the cylinder bore.
- Remove the remaining inner components, seals and spring assembly. Compressed air may be useful in removing these components. If no compressed air is available, be VERY careful not to score the wheel cylinder bore when removing parts from it. Discard all components for which replacements were supplied in the rebuild kit.
- Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
- Allow the parts to air-dry or use compressed air. Do not use rags for cleaning, since lint will remain in the cylinder bore.
- Inspect the piston and replace it if it shows scratches.
- Lubricate the cylinder bore and seals using clean brake fluid.
- Position the spring assembly.
- Install the inner seals, then the pistons.
- Insert the new boots into the counterbores by hand. Do not lubricate the boots.
- Install the wheel cylinder.