Attention! See warning at the beginning of Section Removal and installation of brake calipers!
Simultaneously with the replacement of the brake shoes, their coupling and guide springs should also be replaced, which, as a result of constant cyclic mechanical and thermal loads, stretch / sag over time, stopping developing the required force, which leads to sticking of the brakes and accelerated wear of the drums.
1. Loosen rear wheel nuts. Jack up the back of the car and place it on jack stands. Support the front wheels with wheel chocks. Remove wheels.
2. Release the parking brake. And remove the brake drums.
Note. The drum should be removed from the hub quite freely, but in case of difficulty, gently tap it with a soft-faced hammer. If the drum still cannot be removed, the brake shoes should be pressed from its working surface. Remove the rubber plug from the brake shield, insert a screwdriver into the opened hole and use it to remove the self-regulator lever from the adjusting sprocket. Rotate the sprocket with a second screwdriver until the drum is completely free. If the drum "stuck" to the hub, screw a pair of bolts of a suitable size into the threaded holes in its end surface and try to move the assembly by gradually tightening them.
Note. The replacement of the shoes must be carried out simultaneously on both brake mechanisms. To avoid confusion during assembly, the dismantling of the brake mechanisms must be carried out one by one - the second one can be used as a sample during assembly
3. Thoroughly clean the components of the mechanism from brake dust using a special tool.
4. Remove the wheel bearing hub assembly (see chapter Suspension and steering).
5. Remove the guide springs with their cups from the brake shoes.
6. Pull the front shoe forward just enough to disengage it from the corresponding wheel cylinder piston and anchor plate, then disconnect the bottom return spring from the shoe.
7. Pull back the rear shoe and release it from the second piston of the wheel cylinder.
8. Remove self-regulator assembly (try to remember the installation position of the assembly).
9. Disconnect the upper return spring from the front shoe and remove the latter from the brake mechanism.
10. Disconnect the top return spring from the rear shoe.
11. Disconnect the parking brake cable from the actuating lever on the rear shoe assembly, remove the rear shoe.
12. After pulling back the anthers of the wheel cylinder pistons, check the assembly for signs of leak development. Replace cylinder if necessary (see Section Removal and installation of wheel cylinders).
13. Wash the brake shield with a special compound, then lubricate the areas of its surface in contact with the shoes with high-temperature grease.
14. Remove the retaining ring securing the axle of the parking brake actuating lever. Remove the lever and transfer it to the new rear shoe. Do not forget to place a washer under the lever and replace the retaining ring.
15. Connect the parking brake cable to the actuating lever.
16. Install the rear shoe assembly on the brake shield. Insert the anchor pin into the hole and install the guide spring with cup.
17. Clean threads on screw portion of regulator assembly and lubricate with high temperature grease. Lubricate the end of the screw shaft with the same grease.
18. Insert the tip of the adjuster into the mating slot in the rear brake shoe assembly. Make sure that the regulator is deployed on the mechanism in the correct way.
19. Install the front shoe and secure it with the guide spring. Make sure that the tips of the regulator assembly are properly engaged with both shoes.
20. Install the return springs.
21. Before installing the drum, check it for cracks, scuffs, grooves, signs of overheating and other defects. If serious damage is detected, the traces of which cannot be eliminated by treating the drum with fine-grained sandpaper, the drum should be given to the groove (in compliance with the maximum allowable repair diameter).
Note. The compilers of this Guide recommend turning drums, regardless of their condition, in order to remove all kinds of defects and eliminate ovality. If the reaming of the drum cannot be done without violating the requirements for the maximum allowable inner diameter (beaten on a drum), you will have to replace it. If turning the drums is not possible, at least thoroughly clean their working surfaces with fine-grained sandpaper.
22. By rotating the regulator sprocket, achieve such a position of the brake shoes so that the drum is put on them without much difficulty. Having put on the shoe, through the hole in the brake shield, by rotating the sprocket of the regulator, press the shoes to the working surface of the drum, then release them again so that the drum begins to rotate freely. Depress the foot brake pedal firmly several times, then make sure that the drum rotates freely when the pedal is released, if necessary, tighten the adjuster sprocket accordingly.
23. Install the wheel, lower the vehicle to the ground and tighten the wheel nuts to the required torque (see Specifications to Chapter Settings and ongoing maintenance).
24. Brake the vehicle several times while driving both forward and reverse in order to perform automatic brake adjustment (don't forget to cock the parking brake a few times as well).
25. Before starting the operation of the car, make sure that the brakes are working properly.