REMOVAL & INSTALLATION
See Figures 1 through 21
- Raise and support the vehicle and remove the wheel and brake drum from the wheel to be worked on.
If you have never replaced the brakes on a car 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.
- Contract the brake shoes by pulling the self-adjusting lever away from the starwheel adjustment screw and turn the starwheel up and back until the pivot nut is drawn onto the starwheel 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 adjusting lever.
- Remove the primary shoe-to-anchor spring with a brake tool. (Brake tools are very common and are available at auto parts stores). Remove the secondary shoe-to-anchor spring and unhook the cable anchor. Remove the anchor pin plate.
- Remove the cable guide from the secondary shoe.
- Remove the shoe hold-down springs, shoes, adjusting screw, pivot nut, and socket. Note the color 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, 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 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.
- 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 starwheel screw. Turn the adjusting screw into the adjusting pivot nut to the limit of the threads and then back off 1 / 2 turn.
Interchanging the brake shoe adjusting screw assemblies from one side of the vehicle to the other would cause the brake shoes to retract rather than expand each time the automatic adjusting mechanism operated. To prevent this, the socket end of the adjusting screw is stamped with an R or an L for RIGHT or LEFT. The adjusting pivot nuts can be distinguished by the number of lines machined around the body of the nut; one line indicates left hand nut and 2 lines indicates a right hand nut.
- 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 starwheel. 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 starwheel one tooth. The lever should contact the adjusting screw starwheel 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 starwheel is properly seated in the notch in the shoe web.
See Figures 22 abd 23
The drum brakes are self-adjusting and require a manual adjustment only after the brake shoes have been replaced.
To adjust the rear brakes with drums installed, follow the procedure given below:
- Raise the vehicle and support it with safety stands.
- Remove the rubber plug from the adjusting slot on the backing plate.
- Turn the adjusting screw using a Brake Shoe Adjustment Tool or equivalent inside the hole to expand the brake shoes until they drag against the brake drum and lock the drum.
- Insert a small screwdriver or piece of firm wire (coat hanger wire) into the adjusting slot and push the automatic adjusting lever out and free of the starwheel on the adjusting screw and hold it there.
- Engage the topmost tooth possible on the starwheel with the brake adjusting spoon. Move the end of the adjusting spoon upward to move the adjusting screw starwheel downward and contract the adjusting screw. Back off the adjusting screw starwheel until the wheel spins FREELY with a minimum of drag about 10 to 12 notches. Keep track of the number of turns that the starwheel is backed off, or the number of strokes taken with the brake adjusting spoon.
- Repeat this operation for the other side. When backing off the brakes on the other side, the starwheel adjuster must be backed off the same number of turns to prevent side-to-side brake pull.
- When all drum brakes are adjusted, remove the safety stands and lower the vehicle and make several stops while backing the vehicle, to equalize the brakes at all of the wheels.
- Road test the vehicle. PERFORM THE ROAD TEST ONLY WHEN THE BRAKES WILL APPLY AND THE VEHICLE CAN BE STOPPED SAFELY!