Attention! 1. Brake pads are changed only as a set for one axle.
2. With each replacement of the drum brake pads, the return and clamping springs of the pads also change. Due to the continuous heating/cooling that the springs are subjected to, they lose their elasticity and over time the pads touch the drums, causing them to wear out.
1. Loosen the rear wheel nuts, raise the rear of the car. Remove rear wheels.
2. Remove the drum (or hub, if a fully unloaded axle shaft is installed on the vehicle). On a vehicle with semi-unloaded axle shafts, the drum may not be removable. In this case, pour penetrating liquid between the axle shaft flange studs and the drum holes and tap the drum from the inside along the contour.
If the pads interfere with the removal (a wear notch has formed on the drum), then bring the pads together. To do this, remove the plug from the brake shield and insert a Phillips screwdriver into the hole. In this case, the parking brake pad drive lever will move away from the limiter and the pads will slightly move away from the drum.
3. Clean the brake with a special cleaner.
4. Remove the compression springs by pushing and turning the cups 90°until the slot in the spring pin aligns with the slot in the cup.
5. Remove the drive spring and governor drive (see photo).
6. Spread the lower ends of the shoes and bring the lower return spring out through the thrust plate. Bring the ends of the pads together and remove the spring (see photo).
7. Remove the pads together with the upper spring by spreading them apart and lifting (see photo).
8. Remove the upper return spring assembly with the regulator stud. Remove the shoe drive lever from the rear shoe (see photo).
9. Clean the brake drum and check its condition, the presence of deep grooves on the working surface, signs of overheating (which appear as small colored areas) and cracks. If the drum is worn out, or the ovality exceeds the norm, then it should be machined in a car service.
10. If traces of brake fluid leakage from the wheel cylinder are found, then replace the cylinder as an assembly, or disassemble and replace worn or damaged parts.
11. Check up an inhaling of bolts of fastening of a board of a brake. Clean the brake shield from dirt and corrosion.
12. Check the operation of the brake pad adjuster. If the regulator sticks, is severely worn, or has free play, replace the regulator assembly.
13. Lubricate the parking brake cable and shoe drive lever shaft. Hook the lever onto the block and make sure that the lever moves freely, without jamming.
14. Lubricate with high-temperature grease the contact points of the pads with the brake shield (see photo).
15. Connect the pads to the regulator stud and the top return spring.
16. Attach the parking brake cable to the shoe drive lever.
17. Install the pads in place, leading behind the axle shaft flange. Bring the bases of the pads together so that the upper ends come out of the wheel cylinder boots, preventing damage to the boots.
•18. Bring the bases of the shoes and put on the lower return spring. Separate the pads and place on the brake shield, slide them behind the stop plate. Install pressure springs.
19. Install the governor actuator spring, then install the lower return spring.
20. Install the drum. Adjust the initial clearance between the shoes and the drum. To do this, spread the pads until they come into contact with the drum by turning the toothed nut through the opening in the brake shield. Slightly loosen the nut to move the shoes away from the drum. When finished, replace the plug of the opening in the brake shield.
21. Install the wheel, tighten the nuts and lower the car. Check brake pedal travel. If the brake pedal approaches the body floor at the end of the stroke, the brakes need to be re-adjusted. When finished, check the operation of the brakes before leaving.