Note. Before starting work, read the warning about the dangers and hazards of asbestos dust given at the beginning paragraph 5.
Removing
1. Place wheel chocks under the front wheels. Raise the rear of the vehicle and securely jack stands under it (see «Lifting and placing the car on supports»). Remove the relevant rear wheel and release the parking brake.
2. Remove the screw (-s) drum mounts.
3. It should now be possible to remove the brake drum by hand. When removing the drum, it may be difficult due to the brake pads seizing on the inner surface of the drum. If the brake pads stick, first make sure the parking brake is fully released and then continue as described below.
4. Rotate drum until one of the wheel bolt holes is located above the parking brake lever on the secondary brake shoe. This roughly corresponds to the position «5 o'clock» on the left rear brake and position «7 o'clock» on the right rear brake. Insert a screwdriver through the wheel bolt hole and slide the parking brake lever towards the rear of the vehicle so that the brake pads can be fully retracted. It may be necessary to lift the lever slightly with a screwdriver so that the stop pin on the lever can pass over the brake pad web. Now you can remove the brake drum.
Inspection
Note. If either drum needs to be replaced, BOTH drums must be replaced at the same time. This will ensure uniform and stable braking. You should also install new brake pads.
5. Carefully remove all traces of brake dust from the drum, but never inhale this dust as it is hazardous to health.
6. Clean the outside of the brake drum and check for obvious signs of wear or damage, such as cracks around the wheel bolt holes. Replace the brake drum if necessary.
7. Carefully inspect the inside of the brake drum. Light scratches on the friction surface are normal, but if there are serious scratches, the brake drum should be replaced. The inner edge of the brake drum usually has a strip of rust and brake dust. This strip should be removed until a smooth surface is obtained, which should then be polished with fine sandpaper (№ 120—150). However, if on the surface of the drum, due to its contact with the brake pads, «groove» excessive wear, the brake drum must be replaced.
8. If you suspect that the brake drum has increased wear or an oval shape, you should use an internal micrometer to measure the inner diameter of the drum in several places. Take measurements in pairs - the second measurement is at right angles to the first. Compare the results to evaluate the presence of ovality. It is possible to regrind the brake drum, but on condition that this does not increase its inner diameter beyond the maximum allowable value. If this is not possible, the brake drums on both sides must be replaced. Keep in mind that if the brake drum requires regrinding, BOTH brake drums must be refinished at the same time so that the inner diameter is the same on both sides.
Installation
9. If a new brake drum is to be installed, using a suitable solvent, carefully remove any preservative coating that may have been applied to the inside of the drum. Be aware that it may be necessary to reduce the length of the adjuster strut to install the brake drum over the brake shoes; to do this, turn the adjusting wheel on the column accordingly.
10. Ensure that the parking brake lever stop pin is correctly positioned against the edge of the brake shoe web, and then install the brake drum on the wheel axle.
11. Screw in and tighten the screw (-s) drum mounts.
12. Depress the brake pedal several times to activate the self-adjusting mechanism.
13. Repeat the above procedure on the other rear brake (if it is needed). and then check and, if necessary, adjust the parking brake cable as described in paragraph 13.
14. Finally install the wheel (-A), then lower the vehicle and tighten the wheel bolts to the specified torque.