Order of execution
Warning: Be sure to replace all pads on the same vehicle axle, even if one pad has reached the wear limit. If the pads are to be reinstalled, they must be marked before removal.
1. Clean the brake drum, brake pads and brake shield.
Warning: Brake pads produce brake dust, which contains asbestos, which is harmful to health, so do not use compressed air or inhale the dust when cleaning brake pads.
2. Remove the cuff from the working brake cylinder and, if it is wet, it must be repaired or replaced. When removing the cuff, do not remove the piston from the working brake cylinder.
3. Measure the inner diameter of the brake drum. If drum wear has reached limits, replace both rear brake drums.
4. Secure the brake shoe in a vise, install the tension spring (1) on the spreader bar (2) and the front brake shoe and put the expansion bar on the brake shoe (3 - wedge, 3438 - device for installing the clamping spring).
5. Install the brake shoe with the handbrake lever into the expansion bar.
6. Install the top return spring.
7. Install the wedge tension spring.
8. Connect the handbrake cable to the handbrake lever on the brake shoe.
9. Install the upper part of the brake pads into the grooves on the pistons of the working brake cylinder.
10. Install the lower return spring on the brake shoes, then install the bottom of the shoes on the shoe support.
11. Install retaining pins, compression springs and cups.
12. Press down on the cup while holding the retaining pins on the back of the brake shield and turn the cup 90°until it locks into place.
13. Move wedge up to create maximum brake pad clearance.
14. Install the brake drum on the hub and secure it with the screw.
15. Press the brake pedal once to set the required brake pad clearance.
16. Adjust the handbrake cables.
17. Install wheels and lower vehicle.
18. Repeat these operations on the second rear wheel.
Security Control Check
1. Check if the brake hoses are securely tightened.
2. Check if the brake hose is fixed in the holder.
3. Check if the bleeder fittings are securely tightened.
4. Check if the brake fluid level is sufficient.
5. Check with the engine running. Within about 10 seconds, press the brake pedal with a force of 20–30 kg / m, while the pedal should not fall through.
6. Check the tightness of all listed connections.
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