1. Removal valve; air; 2. Brake caliper; 3. Guide pin; 4. Anther; 5. Piston; 6. Oil seal; 7. Piston boot; 8. Retainer; 9. Screw; 10. Washer; 11. Screw; 12. Internal anti-friction lining; 13. Brake shoe; 14. External anti-friction lining; 15. Caliper bracket
Withdrawal
1. Remove the rear wheel. Nut tightening torque: 90-110 Nm.
2. Remove the retainer and disconnect the brake hose from the caliper.
3. Remove the screws (1) guide pins and remove the brake caliper from the bracket (2).
4. Remove the brake pads (3) and anti-friction pads (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 it into the hole to remove it (5) screw M8.
Note: When removing the disc, do not use a hammer to avoid damaging the hub or disc.
Examination
Brake disk
6. Clean the surface of the brake disc and measure its thickness at 8 equidistant points. Nominal value: 10.0 mm. Minimum allowable value: 8.0 mm. The difference of all measurements should not exceed 0.01 mm. If the measured value is less than the limit, replace the brake disc.
Note: The brake disc and pads are replaced as a set on both sides.
7. Install the dial indicator (6) approximately 5 mm from the edge of the disc and check for runout. Rated value: less than 0.03mm.
8. If runout is greater than rated, replace disc hub and recheck runout.
Note: Before removing the disc, mark the stud on the side with the highest runout with chalk.
9. If runout is within specification, rotate brake disc 180°from mark, install disc and recheck runout.
10. If it is not possible to correct the amount of runout by changing the position of the disc, replace the brake disc.
Brake pads
11. Check friction lining wear. 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 up absence of traces of oil and greasing on working surfaces of brake pads.
Installation
13. Install the brake disc and caliper bracket. Tightening torque: 83-93 Nm.
14. Install the fasteners (7) into the caliper bracket (8).
15. Install anti-friction pads and brake pads in the caliper bracket.
16. Using a suitable tool, press the piston into the caliper to install it over the pads.
17. Lower the caliper down. Be careful not to damage the anthers of your fingers. Install and tighten the guide pin screws. Tightening torque: 22-31 Nm.
Note: if the caliper was removed, connect the brake hose.
18. Bleed the brake hydraulics and check for leaks.