Checking the thickness of the brake pad friction linings
1 – plug; 2 – brake shield
Rear wheel drum brake mechanism parts
1 – front brake shoe; 2 – spring; 3 – cup; 4 – lower tension spring; 5 – pressure spring of the spacer bar; 6 – upper tension spring; 7 – rear brake shoe; 8 – manual drive lever; 9 – spacer bar; 10 – adjusting wedge; 11 – wheel cylinder; 12 – wheel cylinder mounting bolt; 13 – rack; 14 – brake shield; 15 – plug; 16 – brake shoe stop; 17 – lower brake shoe support; 18 – adjusting wedge pressure spring
Disassembling brake pads
1 – adjusting wedge pressure spring; 2 – front brake shoe; 3 – hook; 4 – upper tension spring; 5 – rear brake shoe
Removal the spacer bar
1 – front brake shoe; 2 – adjusting wedge; 3 – spacer bar pressure spring; 4 – hook; 5 – spacer bar; 6 – protrusion on the adjusting wedge
Installing the spacer bar
1 – pressure spring of the spacer bar; 2 – front brake shoe; 3 – spacer bar
Minimum permissible friction lining thickness (without basis) – 1.5 mm.
You can check the thickness and condition of the brake pads without removing the wheel through the inspection hole on the inside of the brake shield 2 (see figure Checking the thickness of the brake pad friction linings), closed with plug 1.
Replace brake pads in the following cases:
- the thickness of the friction lining is less than the permissible value;
- the surface of the linings is oily;
- the pads are not firmly connected to the base;
- there are deep grooves and chips on the overlays.
Caution! Brake pad sets must be replaced on both sides of the front suspension at the same time.
Caution: Do not use gasoline, diesel fuel, or any other mineral solvents to clean brakes.
1. Remove the brake drum (see subsection 9.7.2).
2. Press with pliers on cup 3 (see the figure Rear wheel drum brake mechanism parts), rotate it 90° (holding the stand 13 on the back side of the brake shield 14), remove cup 3 together with spring 2 and take out stand 13 from the back side of the brake shield. Remove the strut with the spring and cup of the other shoe in the same way.
3. Using a screwdriver, remove the lower toes of the base of pads 1 and 7 from the lower support 17.
4. Disconnect the lower tension spring 4 from the pads.
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5. Disconnect the parking brake cable from the handbrake lever 8.
6. Carefully move pads 1 and 7 apart and remove them from brake shield 14.
7. Clamp the brake pads in a vice.
8. Remove the pressure spring 1 (see figure Disassembling brake pads) adjusting wedge.
9. Remove the upper tension spring 4 and remove the rear shoe 5 from the vice (with manual drive lever).
10. Remove the pressure spring 3 (see figure Removing the spacer bar) spacer bar.
11. Remove the spacer bar 5 with the adjusting wedge 2.
12. Before installing new pads, reduce the pistons of the wheel cylinder 11 (see the figure Rear wheel drum brake mechanism parts), by pressing on them with two crowbars.
13. Lubricate the contact points of the spacer bar with the shoe using solid plastic grease G 000 650 or other consistent grease.
14. Connect the pressure spring 1 (see figure Installing the spacer bar) spacer bar to the front shoe 2 and install spacer bar 3 on the shoe.
15. Connect the other end of the pressure spring to the spacer bar.
16. Install the adjusting wedge, aligning the protrusion 6 (see figure Removing the spacer bar) on the wedge outward.
17. Insert the rear brake shoe into the slot of the spacer bar, having previously lubricated the contact areas of the bar with the shoe with solid plastic grease G 000 650 or another consistent grease.
18. Install the upper tension spring 6 (see the figure Rear wheel drum brake mechanism parts).
19. Install the pressure spring 18 of the adjusting wedge.
20. Carefully install the brake pads onto the brake shield.
21. Connect the parking brake cable to the handbrake lever 8.
22. Lubricate the contact areas of the lower return spring and the pads with solid plastic grease G 000 650 or other consistent grease.
23. Install the lower tension spring 4 and insert the ends of the pads into the lower support 17.
24. Install the struts 13 on the back side of the brake shield, put the springs 2 on them and fix them using the cups 3 (turning them 90°).
25. Install the brake drum.
26. Press the brake pedal several times to bring the pistons into working position.
27. Adjust the parking brake and install the wheel. Only tighten the wheel bolts fully when the vehicle is on the ground.
The tightening torque of the wheel mounting bolts is 120 Nm.