Master brake cylinder.
1 - reservoir cap, 2 - filter, 3 - brake fluid reservoir, 4 - sealing sleeve, 5 - brake master cylinder body, 6 - secondary piston assembly with spring, 7 - primary piston assembly with spring, 8 - retaining ring.
Withdrawal
1. Disconnect brake pipes from the main brake cylinder. Install plugs on open holes.
Caution: Do not allow brake fluid to come into contact with painted surfaces. If brake fluid comes into contact with a painted surface, wash it off immediately.
2. Turn away nuts of fastening of the main brake cylinder and remove the cylinder.
Disassembly
1. Remove the brake fluid reservoir cap and drain the brake fluid into a suitable container.
2. Using a screwdriver, disconnect the tank from the master brake cylinder, remove the sealing sleeves.
Note: do not press the brake pedal when bleeding the brake system.
3. Using a special puller, remove the retaining ring.
4. (Models with ABS) Remove the piston stroke stop.
5. Remove the primary piston assembly.
6. (Models with ABS) Using a screwdriver, remove the piston stroke stop.
7. Remove secondary piston assembly.
Note: Do not disassemble pistons.
Examination
1. Check up absence of a rust and scoring marks on an internal surface of the case of the main brake cylinder.
- Master cylinder nominal bore: 23.8mm
2. Check up absence of traces of a rust, scuffing, deterioration and damages on primary and secondary pistons of the main brake cylinder.
Note:
- If the inner surface of the master cylinder housing is damaged, replace the brake master cylinder assembly.
- Wash parts of the master brake cylinder with alcohol.
Assembly
1. Lubricate all rubber parts of the brake master cylinder kit and sealing bushings with clean brake fluid.
2. Carefully install the springs and pistons into the master cylinder.
3. Press the piston with a screwdriver and install the circlip.
4. Press the piston until the spring is fully compressed and install the piston travel stop.
5. Install the sealing sleeves.
6. Establish a tank of a brake liquid on the main brake cylinder.
Installation
1. Check and, if necessary, adjust the stem length.
- Torque: 8.25±0.125mm
2. Establish the main brake cylinder on the vacuum booster and tighten two nuts.
- Tightening torque: 8-12 Nm
3. Connect brake pipes to the main brake cylinder.
- Tightening torque: 13-17 Nm
4. Fill the reservoir with brake fluid, then bleed the brake system.