You can check the thickness of the pads through the inspection holes in the shields without removing the brake drums.
Replace brake pads in sets (i.e. all four pads at the same time). Replacing the pad on only one brake results in uneven braking.
Replacing the pads - manual brake mechanism (drawing O:14)
1. Loosen the rear wheel mounting bolts, lift and support the rear of the vehicle and remove the wheels. Release the handbrake completely.
2. Remove the hub cap, then remove the cotter pin and crown nut retainer from the hub journal, unscrew the hub nut and remove the thrust washer.
Move the brake shoes to release the drum. To do this, turn the adjusting nut with a screwdriver through the adjusting hole in the brake shield.
3. Carefully remove the hub and brake drum together with the bearings.
NOTE: On vehicles with a rear brake pressure regulator, drum removal may be difficult due to residual pressure in the system. To relieve residual pressure, push the pressure regulator lever toward the rear axle.
4. Remove the upper brake shoe tension spring. The spring is U-shaped and under a lot of tension - be careful when disconnecting the spring.
5. Remove the shoe retainers. To remove a retainer, press it down and pull the retainer off the shoe until the strut head comes out of the retainer slot.
6. Remove the adjusting spacer located between the pads.
7. Disconnect the front shoe from the wheel cylinder and lower support; unhook the lower tension spring from the shoe.
8. Remove the rear brake shoe in the same way; disconnect the handbrake cable from the brake shoe lever.
9. Place a rubber ring on the wheel brake cylinder to press the pistons together.
10. Inspect the wheel cylinder, brake drum and springs. If there are signs of fluid leakage, replace or repair the cylinder.
11. Clean the brake shield and brake drum from dust. Apply a small amount of high-melting grease to the shoe supports on the brake shield and the ends of the brake shoes.
12. Thoroughly clean the brake drum from dust and dirt. If there are uneven areas on the friction surface of the drum, the drum must be bored or replaced, otherwise the uneven areas will cause accelerated wear of the new pads.
13. Inspect the brake shoe tension springs. If there are cracks, deep corrosion, signs of overheating or other defects, replace the spring.
14. Check the ease of rotation of the adjusting nut. If necessary, thoroughly clean the threads and lubricate the adjusting spacer parts.
15. Attach the handbrake cable to the lever on the rear shoe. To hook the end of the cable onto the lever, pull back the cable return spring.
16. Install the brake shoes and return springs on the brake shield in the reverse order of removal. Make sure that the springs, brake shoes, and adjusting spacer are positioned correctly. Secure the shoes with stands and clamps.
17. Install the hub and brake drum and adjust the hub bearings (see chapter "Rear suspension").
18. Insert a screwdriver into the adjustment hole of the brake shield and turn the adjusting nut until the shoes lock the drum. Then turn the nut in the opposite direction just enough so that the drum starts to rotate freely. Adjust the handbrake cable (see chapter "Car maintenance work").
19. After replacing the pads on both brakes, install the wheels, lower the vehicle to the ground and tighten the wheel mounting bolts to the torque specified in section "Technical data".
Replacing pads - brake mechanism with automatic regulator (drawing O:19)
1. Raise and support the rear of the vehicle. Remove the rear wheels, fully release the handbrake and remove the brake drums as described above. To move the brake shoes, insert a screwdriver through the hole in the wheel bolt and push the adjuster wedge upwards (drawing O:15).
2. Remove the brake shoe struts. To remove the strut, press on the strut cup and remove it by turning it a quarter turn. Remove the strut spring (drawing O:16).
3. Disconnect the lower ends of the pads from the support and unhook the lower tension spring from the pads.
4. Disconnect the spring from the lower end of the adjuster wedge and from the front brake shoe. Disconnect the upper return spring from the front end of the adjuster spacer and the rear brake shoe. Remove the front brake shoe from the brake shield.
5. Remove the rear brake shoe from the brake shield and disconnect the handbrake cable from the lever on the shoe.
6. Place a rubber ring on the wheel brake cylinder to press the pistons together.
7. Clamp the adjuster spacer in a vice and detach the spring from its end, then separate the spacer, adjuster wedge and front brake shoe from each other.
8. Check the condition of the wheel cylinder, brake drum and springs.
9. Clean the brake shield and brake drum from dust. Apply a small amount of high-melting grease to the support on the brake shield and the ends of the brake shoes, as well as to the wedge of the adjuster, the ends of the adjuster spacer and the axle of the handbrake lever.
10. Attach the handbrake cable to the lever on the rear shoe. To hook the end of the cable onto the lever, pull back the cable return spring.
11. Assemble the spacer and the adjuster wedge with the front brake shoe as shown in Figures O:17 and O:18. Insert the wedge with the thicker part towards the brake shield.
12. Install the brake shoes and return springs on the brake shield in the reverse order of removal. Make sure that the springs, brake shoes, spacer and adjuster wedge are positioned correctly. Secure the shoes with posts with springs and cups.
13. Install the brake drum and adjust the hub bearings (see chapter "Rear suspension").
14. Press the brake pedal firmly several times to set the brake shoes to the working position. Adjust the handbrake cable (see chapter "Car maintenance work").
15. After replacing the pads on both brakes, install the wheels, lower the vehicle to the ground and tighten the wheel mounting bolts to the torque specified in the section "Technical data".
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