REMOVAL & INSTALLATION
See Figures 1 and 2
- Raise and safely support the vehicle on jackstands and remove the wheel, hub, and drum.
- Loosen, but do not remove, the screws or nuts which hold the wheel cylinder to the backing plate.
- Disconnect the brake line at the fitting on the brake backing plate.
- Remove the brake assemblies, as described earlier in this section.
- Remove the wheel cylinder retaining fasteners, then remove the wheel cylinder from the backing plate.
- Installation is the reverse of the removal procedure. Tighten the wheel cylinder-to-backing plate fasteners to 18 ft. lbs. (25 Nm) and the brake line-to-wheel cylinder connection to 160 inch lbs. (18 Nm).
See Figure 3
Wheel cylinder rebuilding kits are available for reconditioning wheel cylinders. The kits usually contain new cup springs, cylinder cups and, in some cases, new boots. The most important factor to keep in mind when rebuilding wheel cylinders is cleanliness. Keep all dirt away from the wheel cylinders when you are reassembling them.
- Remove the wheel cylinder, as described earlier in this section.
- Remove the rubber dust covers on the ends of the cylinder.
- Remove the pistons and piston cups and the spring.
- Remove the bleeder screw and make certain that it is not plugged.
- Discard all of the parts that the rebuilding kit will replace.
- Examine the inside of the cylinder. If it is severely rusted, pitted or scratched, then the cylinder must be replaced as the piston cups will not be able to seal against the walls of the cylinder.
- Using emery cloth or crocus cloth, polish the inside of the cylinder. Do not polish in a lengthwise direction. Polish by rotating the wheel cylinder around the polishing cloth supported on your fingers. The purpose of this is to put a new surface on the inside of the cylinder. Keep the inside of the cylinder coated with brake fluid while polishing.
Honing the wheel cylinders is not recommended due to the possibility of removing too much material from the bore, making it too large to seal.
- Wash out the cylinder with clean brake fluid after polishing.
- When reassembling the cylinder dip all of the parts in clean brake fluid.
- Reassemble the wheel cylinder in the reverse order of removal.
- Install the wheel cylinder.