Replace pads in the following cases:
- thickness of friction linings less than permissible (the size measured by the diameter of the brake pads installed in the brake mechanism is less than the specified);
- the surface of the pads is oiled;
- the friction lining is loosely connected to the base;
- linings have deep grooves and chips.
Attention! Do not use gasoline, diesel fuel or any other mineral solvents to clean the brakes. Replace pads simultaneously in the brake mechanisms of both rear wheels.
You will need: wheel bolt wrench, pliers or flat blade screwdriver, sliding pliers.
1. Engage 1st gear and chock the front wheels.
2. Check that the parking brake lever is pushed all the way down (the car is disinhibited).
3. Remove the wheel (see «Wheel replacement») and put the car on a stand.
4. If the brake fluid level in the master cylinder reservoir is at the mark «MAX» or approaches it, pump some of the fluid out of the tank. Otherwise, when replacing the pads, it may splash out.
5. Remove the brake drum (see «Removal and installation of a brake drum»).
6. Disconnect the spring of the clearance adjuster lever from the front shoe...
7.... and remove the spring by disconnecting its other end from the regulator lever.
8. Remove the clearance adjuster lever.
9. Using a screwdriver, pry the lower shoe return spring out of the hole in the rear brake shoe...
10.... and remove the spring.
11. Unhook the bent end of the upper coupling spring from the rear block with pliers...
Attention! Be careful when working with pliers or a screwdriver. We recommend using special pliers to remove the coupling springs.
12.... and, turning the second end of the spring in the hole in the front shoe, remove the spring.
13. Slightly move the front shoe forward...
14.... and, holding the rear block, remove the gap adjuster together with the spacer bar, turning the bar 90°along the axis.
15. While holding the support post, press down on the compression spring mounting cup, turn it a quarter of a turn...
16.... and remove the cup and spring, as well as the support post.
17. Take the rear shoe away from the brake shield, disconnect the expansion lever from the parking brake cable by pressing its spring with pliers, and remove the shoe.
18. Remove the pressure spring and the front shoe support post in the same way as you did for the rear shoe (pp. 15 and 16), and remove the front shoe.
Attention! Immediately after removing the pads, secure the pistons of the working cylinder in any way possible (for example, tie with a rubber band or tie with wire), Otherwise, the pistons may be pushed out of the cylinder by the spacer spring and brake fluid will leak out of the hydraulic system.
9.8. Rear wheel brake parts (shows the details of the brake mechanism on the left side): 1 - cups of clamping springs; 2 - clamping springs; 3 - support posts; 4 – a forward block of the brake mechanism of a back wheel; 5 - clearance adjuster lever; 6 - upper coupling spring; 7 - unclamping lever of the parking brake; 8 – a back block of the brake mechanism of a back wheel; 9 - spacer bar; 10 - lower coupling spring; 11 - clearance regulator; 12 – a spring of the lever of a regulator of backlashes
19. Clean and inspect brake parts (pic. 9.8). Replace deformed or heavily corroded parts. Strongly stretched, lost elasticity and bent springs replace.
Note. Whenever dismantling the brake mechanism, replace the pressure springs, spring cups and support legs with new ones.
Note. The parts of the spacer bar and the gap adjuster of the left brake mechanism are not interchangeable with the corresponding parts of the right brake mechanism, do not confuse them!
Front 1 and rear 2 rear brake pads are different in design. In addition, the brake pads are different as left and right.
20. Apply refractory brake grease to the friction points of the front and rear brake pads on the brake shield.
21. Lubricate the thread of the rod 1 of the spacer bar with refractory grease for brake mechanisms and screw the nut 2 onto it to the end, but do not tighten it.
Note. We recommend replacing the spacer strips complete with clearance adjusters with each replacement of the brake pads.
22. Release the pistons of the working cylinder from the fixing device, use sliding pliers to compress the pistons of the working cylinder and install the brake shoes in the reverse order of removal.
Attention! Please note that when the pistons are sunk into the cylinder, the level of brake fluid in the reservoir of the master brake cylinder rises. Pump out the fluid if necessary.
23. Install the brake drum (see «Removal and installation of a brake drum»).
24. Adjust the clearance between the brake shoes and the drum by pressing the brake pedal 10-15 times. Each time you press it, you should hear the knob click. If the clicks stop, the clearance is set.
25. Reinstall the wheel. Check for ease of rotation.
26. Similarly, replace the brake pads of the brake mechanism of the other wheel.
27. After installing the brake pads, adjust the parking brake system (see «Parking brake actuator adjustment»).