- Raise and support the rear of the vehicle. Make certain to block the front wheels to keep the vehicle from rolling. Do not apply the parking brake, otherwise the rear drums will not be able to be removed.
- Remove the rear wheels.
- Pull the rear brake drums off of the lug studs. It may be necessary to loosen the brake shoes, as described earlier in this section in the brake adjustment procedure.
- Inspect the brake shoe linings for any damage which could affect the functioning of the rear brakes, such as cracking or chipping of the brake shoe lining material.
- Replace the brake shoes if they are worn to within 1 / 32 (0.79.4cm) of any rivet head, or when the lining is soaked with brake fluid, oil or grease.
- If the brake drum and linings are in good condition, install the wheel and brake drum. The condition of the brake drum and shoe linings of the opposite wheel will usually be about the same as the wheel removed. It is a good idea, however, to check the other wheel anyhow.
- Lower the vehicle and remove the blocks from the front wheels.
REMOVAL & INSTALLATION
See Figures 1 through 17
- Raise and support the rear end on jackstands.
- Remove the wheel and brake drum from the side to be worked on.
If you have never replaced the brakes on a vehicle before and you are not too familiar with the procedures involved, only disassemble and assemble one side at a time, leaving the other side intact as a reference during reassembly.
- Install a clamp over the ends of the wheel cylinder to prevent the pistons of the wheel cylinder from coming out, causing loss of fluid and much grief.
- Contract the brake shoes by pulling the self-adjusting lever away from the star wheel adjustment screw, then turn the star wheel up and back until the pivot nut is drawn onto the star wheel as far as it will come.
- Pull the adjusting lever, cable and automatic adjuster spring down and toward the rear to unhook the pivot hook from the large hole in the secondary shoe web. Do not attempt to pry the pivot hook from the hole.
- Remove the automatic adjuster spring and the adjuster lever.
- Remove the secondary shoe-to-anchor spring with a brake tool.
Brake tools are very common implements and are available at auto parts stores.
- Remove the primary shoe-to-anchor spring and unhook the cable anchor. Remove the anchor pin plate, if so equipped.
- Remove the cable guide from the secondary shoe.
- Remove the shoe hold-down springs, shoes, adjusting screw, pivot nut, and socket. Note the color and position of each hold-down spring for assembly. To remove the hold-down springs, reach behind the brake backing plate and place one finger on the end of one of the brake hold-down spring mounting pins. Using a pair of pliers, grasp the washer type retainer on top of the hold-down spring that corresponds to the pin that you are holding. Push down on the pliers and turn them 90° to align the slot in the washer with the head on the spring mounting pin. Remove the spring and washer retainer and repeat this operation on the hold-down spring on the other shoe.
- Remove the parking brake link and spring. Disconnect the parking brake cable from the parking brake lever.
- After removing the rear brake secondary shoe. On 9 in. (23cm) brakes remove the parking brake lever from the shoe. On 10 in. (25.4cm) brakes disassemble the parking brake lever from the shoe by removing the retaining clip and spring washer.
- Assemble the parking brake lever to the secondary shoe, and on 10 in. (25.4cm) brakes secure it with the spring washer and retaining clip.
- Apply a light coating of Lubriplate® at the points where the brake shoes contact the backing plate.
- Position the brake shoes on the backing plate, and install the hold-down spring pins, springs, and spring washer type retainers. Install the parking brake link, spring and washer. Connect the parking brake cable to the parking brake lever.
- Install the anchor pin plate, and place the cable anchor over the anchor pin with the crimped side toward the backing plate.
The primary brake shoe is the shoe with the smallest amount of friction surface and the secondary shoe has the larger friction surface. Always make sure the primary shoe is facing forward and the secondary is facing rearward after installation.
- Install the primary shoe-to-anchor spring with the brake tool.
- Install the cable guide on the secondary shoe web with the flanged holes fitted into the hole in the secondary shoe web. Thread the cable around the cable guide groove.
- Install the secondary shoe-to-anchor (long) spring. Be sure that the cable end is not cocked or binding on the anchor pin when installed. All of the parts should be flat on the anchor pin. Remove the wheel cylinder piston clamp.
- Apply Lubriplate® to the threads and the socket end of the adjusting star wheel screw. Turn the adjusting screw into the adjusting pivot nut to the limit of the threads and then back off 1 / 2 turn.
- Place the adjusting socket on the screw and install this assembly between the shoe ends with the adjusting screw nearest to the secondary shoe.
- Place the cable hook into the hole in the adjusting lever from the backing plate side. The adjusting levers are stamped with an R (right), or an L (left), to indicate their installation on the right or left hand brake assembly.
- Position the hooked end of the adjuster spring in the primary shoe web and connect the loop end of the spring to the adjuster lever hole.
- Pull the adjuster lever, cable and automatic adjuster spring down toward the rear to engage the pivot hook in the large hole in the secondary shoe web.
- After installation, check the action of the adjuster by pulling the section of the cable between the cable guide and the adjusting lever toward the secondary shoe web far enough to lift the lever past a tooth on the adjusting screw star wheel. The lever should snap into position behind the next tooth, and release of the cable should cause the adjuster spring to return the lever to its original position. This return action of the lever will turn the adjusting screw star wheel one tooth. The lever should contact the adjusting screw star wheel one tooth above the center line of the adjusting screw.
If the automatic adjusting mechanism does not perform properly, check the following:
- Check the cable end fittings. The cable ends should fill or extend slightly beyond the crimped section of the fittings. If this is not the case, replace the cable.
- Check the cable guide for damage. The cable groove should be parallel to the shoe web, and the body of the guide should lie flat against the web. Replace the cable guide if this is not so.
- Check the pivot hook on the lever. The hook surfaces should be square with the body on the lever for proper pivoting. Repair or replace the hook as necessary.
- Make sure that the adjusting screw star wheel is properly seated in the notch in the shoe web.
- Install the rear brake drum onto the lug studs.
- Install the rear wheel.
- Lower the vehicle.