1. Removal valve; air; 2. Brake caliper; 3. Guide pin; 4. Dust cover; 5. Piston; 6. Seal; 7. Piston dust cover; 8. Retainer; 9. Screw; 10. Washer; 11. Screw; 12. Inner anti-friction lining; 13. Brake shoe; 14. Outer antifriction lining; 15. Caliper bracket
Removal
1. Remove the rear wheel. Tightening torque of the nuts: 90-110 Nm.
2. Remove the retainer and disconnect the brake hose from the caliper.
3. Unscrew the screws (1) of the guide pins and remove the brake caliper from the bracket (2).
4. Remove the brake pads (3) and anti-friction linings (4).
5. If necessary, unscrew the screws and remove the caliper bracket with the brake disc. If the disc is stuck to the hub due to overheating or corrosion, screw an M8 screw into the hole (5) to remove it.
Note: When removing the disc, do not use a hammer to avoid damaging the hub or disc.
Examination
Brake disc
6. Clean the surface of the brake disc and measure its thickness at 8 equally spaced points. Nominal value: 10.0 mm. Minimum allowable value: 8.0 mm. The difference in all measurements should not exceed 0.01 mm. If the measured value is less than the limit, replace the brake disc.
Note: Brake disc and pads are replaced as a set on both sides.
7. Set the dial indicator (6) approximately 5 mm from the edge of the disc and check the runout. Nominal value: less than 0.03 mm.
8. If the runout value is greater than the nominal value, replace the hub with the disc and recheck the runout.
Note: Before removing the disc, mark the stud on the side with the greatest runout value with chalk.
9. If the runout does not exceed the nominal value, rotate the brake disc 180° relative to the mark, install the disc and recheck the runout.
10. If it is not possible to correct the runout value by changing the position of the disc, replace the brake disc.
Brake pads
11. Check the wear of the friction lining. Nominal value: 10.0 mm. Minimum allowable value: 2.0 mm. If the measured value is less than the limit, replace the brake pads.
12. Check for traces of oil and grease on the working surfaces of the brake pads.
Installation
13. Install the brake disc and caliper bracket. Tightening torque: 83-93 Nm.
14. Install the clamps (7) into the caliper bracket (8).
15. Install the anti-friction linings and brake pads into the caliper bracket.
16. Using a suitable tool, press the piston into the caliper to seat it over the pads.
17. Lower the caliper down. Be careful not to damage the finger dust boots. Install and tighten the guide finger screws. Tightening torque: 22-31 Nm.
Note: If the caliper was removed, reconnect the brake hose.
18. Bleed the brake hydraulic system and check for leaks.