Removing
1. Remove the brake drum.
2. Disconnect the upper brake shoe return spring using a screwdriver and pliers.
3. Spread the upper ends of the brake shoes to release the pistons of the brake wheel cylinder.
Attention! If the brake pads are oily, replace the brake pads.
4. Place a rag under the brake pad support shield.
5. Loosen the union nut 2 of the brake pipe. Do not unscrew the nut completely (see illustration).
7.5 Loosen union nut 2 of the brake pipe.
6. Unscrew both bolts of the wheel brake cylinder (see arrows in illustration 7.5).
Installation
7. Prepare a new brake cylinder.
8. Unscrew completely the union nut of the brake pipe and immediately screw it onto the new brake cylinder. This achieves only a small leakage of brake fluid.
9. Screw in the brake cylinder mounting bolts and tighten them to 10 Nm.
10. Tighten the union nut of the brake pipeline with a force of 20 Nm.
11. Attach the upper return spring to the brake shoes.
12. Replace the brake drum.
13. Remove air from the brake system. As a rule, in such cases, it is sufficient to remove air from the brake cylinder from which the pipeline was disconnected. However, if after bleeding the cylinder the brake pedal «drowns», then you need to pump the entire system.
14. Depress the brake pedal several times to adjust the gap between the brake shoes and the drum.
Attention! Make sure that:
- A) brake hoses are securely connected;
- b) brake hoses are fixed in holders;
- V) fittings for bleeding the brake actuator are wrapped;
- G) there is enough brake fluid in the expansion tank.
15. Perform a brake leak test by starting the engine.
To do this, depress the brake pedal with a force of 200-300 N (20 -30 kg) and hold it for about 10 seconds. The pressure in the system and, accordingly, the resistance of the brake pedal, should not decrease. Check all connections for tightness.
16. Test drive on a light-traffic highway, braking several times.