Note: Before you begin, please read the warning at the beginning of this manual regarding the dangers and hazards of asbestos dust paragraph 5.
Removal
1. Place wheel chocks under the front wheels. Raise the rear of the vehicle and place secure supports underneath it (see "Lifting and installing the car on supports"). Remove the corresponding rear wheel and release the parking brake.
2. Remove the drum mounting screw.
3. It should now be possible to remove the brake drum by hand. When removing the drum, difficulties may arise due to the brake shoes seizing on the inner surface of the drum. If the brake pads are sticking, first make sure the parking brake is fully released, then proceed as described below.
4. Rotate the drum until one of the wheel bolt holes is positioned above the parking brake actuator lever on the secondary brake shoe. This corresponds approximately to the 5 o'clock position on the left rear brake and the 7 o'clock position 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 until the brake shoes can be fully retracted. It may be necessary to slightly lift the lever with a screwdriver to allow the stop pin on the lever to pass over the brake shoe bridge. Now you can remove the brake drum.
Inspection
Note: If either drum requires replacement, replace both drums at the same time. This will ensure consistent and reliable braking. New brake pads should also be installed.
5. Carefully remove all traces of brake dust from the drum, but do not inhale this dust under any circumstances, as it is hazardous to your health.
6. Clean the outside of the brake drum and inspect it 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. There is usually a band of rust and brake dust on the inside edge of the brake drum. This strip should be removed until a smooth surface is achieved, which should then be polished using fine-grit sandpaper (No. 120-150). However, if a "groove" of increased wear forms on the drum surface due to contact with the brake pads, the brake drum should be replaced.
8. If you suspect that the brake drum has excessive wear or is oval, use an internal micrometer to measure the inside diameter of the drum in several places. Take measurements in pairs, with the second measurement at right angles to the first. Compare the results to assess the presence of ovality. It is possible to regrind the brake drum, but only if this does not increase its internal diameter beyond the maximum permissible value. If this is not possible, the brake drums on both sides should be replaced. Please note that if a brake drum requires resurfacing, BOTH brake drums should be resurfaced at the same time to ensure the inside diameter is the same on both sides.
Installation
9. If a new brake drum is to be installed, use a suitable solvent to thoroughly remove any preservative coating that may be applied to the inside of the drum. Please note that to fit the brake drum over the brake shoes, you may need to reduce the length of the adjuster post; to do this, turn the adjustment wheel on the stand accordingly.
10. Make sure that the parking brake lever stop pin is correctly positioned relative to the edge of the brake shoe bridge, and then install the brake drum onto the wheel axle.
11. Screw in and tighten the drum mounting screw.
12. Press the brake pedal several times to activate the self-adjusting mechanism.
13. Repeat the above procedure on the other rear brake (if necessary). and then check and, if necessary, adjust the parking brake cable as described in paragraph 13.
14. Finally, install the wheel, then lower the vehicle and tighten the wheel bolts to the specified torque.