Withdrawal
1. Disconnect the electrical connector from the brake fluid level sensor.
2. Disconnect the brake system pipes from the master brake cylinder and close the opened holes with suitable plugs.
Warning! Brake fluid dissolves paint, plastic, and wire insulation, so if you accidentally spill fluid on your vehicle's paintwork or components, wash it with plenty of water.
3. Turn away nuts of fastening of the main brake cylinder and remove the main brake cylinder. Tightening torque: 8–12 Nm.
Disassembly
1. Remove the plug and drain the brake fluid from the reservoir.
2. Turn out screws and, using a screw-driver as the lever, remove a tank from the main brake cylinder.
3. Remove the retaining ring.
4. Use a screwdriver to press the primary piston, remove the roll pin and remove the primary piston.
5. Use a screwdriver to press the secondary piston, remove the roll pin and remove the secondary piston.
Attention! Do not disassemble the primary and secondary pistons.
Examination
1. Check the inner surface of the brake master cylinder housing for rust and wear.
2. Check the brake master cylinder for wear or damage. Clean or replace the brake master cylinder as needed.
- 1. If the master cylinder housing bore is damaged, replace the brake master cylinder assembly.
- 2. Clean the brake master cylinder body with isopropyl alcohol to remove dirt.
Assembly
1. Lubricate the inner surface of the master cylinder and the outer surfaces of the primary and secondary pistons with the recommended brake fluid.
2. Gently insert the two springs and pistons into the bore of the master cylinder.
3. Press the pistons and install the retaining ring.
4. Use a screwdriver to press the piston and install the roll pin.
5. Install two o-rings.
6. With force insert a tank into sealing rings of the main brake cylinder.
Installation
1. Establish the main brake cylinder on the vacuum amplifier of brakes.
2. Establish the main brake cylinder and the vacuum amplifier of brakes on a partition of a motor compartment.
3. Connect brake pipes to the main brake cylinder.
4. Attach a vacuum hose to the vacuum amplifier of brakes.
5. Connect the rod to the brake pedal and install the pin with the head and the hole for the cotter pin and secure it with a new spring cotter pin.
6. Fill in brake fluid and bleed air from the hydraulic circuit of the brake system.
Attention! Do not attempt to repair the vacuum brake booster, as it is a non-separable type.