Wheel cylinder parts: 1 – protective cap; 2 – piston; 3 – sealing ring; 4 – spring cup; 5 – spring; 6 – cylinder body; 7 – valve sealing ring; 8 – air release valve
You will need:
- key "8"
- clean brake fluid
Remove the wheel cylinder (see subsection 7.2.2.).
Wheel cylinder parts can be replaced without removing the cylinder from the vehicle.
1. Remove the protective caps from both sides of the cylinder.
2. Remove both pistons from the cylinder.
3. Having pushed the spring out of the piston...
4....remove the sealing ring from one side.
5. Remove the sealing ring from the other side in the same way.
6. Remove the spring with cups from the cylinder.
7. Remove the cups from the spring.
8. Unscrew the air release valve.
9. Remove the sealing ring from the valve.
10. Thoroughly clean all dirt from all parts of the wheel cylinder and rinse with clean brake fluid.
11. Inspect the cylinder mirror...
12....and the cylinder piston. If there are deep scratches, roughness, etc., replace the piston or cylinder assembly. Small scratches can be removed by grinding.
13. Replace a broken, cracked or loose spring. The length of the spring in a free state should be 34 mm, and under a load of (35±2) N or (3.5±0.2) kgf – 17.8 mm.
14. Regardless of the condition of the sealing rings, replace them with new ones.
15. Replace cracked, torn or loose cylinder caps.
16. Replace a cracked, torn or loose valve seal or a valve with damaged threads.
17. Assemble the cylinder in the reverse order of disassembly, lubricating all parts with brake fluid. In this case, the slots for the pads in the pistons should be located vertically.
18. Check the piston movement. It should be smooth, without sticking.