Withdrawal master brake cylinder in the following order:
- before starting work, press the brake pedal 5-6 times with the engine off to create the same pressure in the vacuum and atmospheric chambers of the vacuum booster, close to atmospheric (remove the vacuum);
- disconnect the vacuum hose from the vacuum booster;
Pic. 327. Fastening of the main brake cylinder: 1 - tank cover with brake fluid emergency level sensor terminals; 2 - float; 3 - tank; 4 - connecting bushings; 5 - nut, 25 Nm; 6 - main brake cylinder; 7 - sealing ring; 8 - flange for fastening the hose tip; 9 - vacuum booster
- using a siphon-pear pump out the brake fluid from the tank 3 (pic. 327), after the sieve is taken out;
Warning! Never drain brake fluid by mouth through a hose - brake fluid is poisonous.
- disconnect the block with wires from the terminals of the brake fluid emergency level sensor;
- disconnect the clutch master cylinder hose;
- if necessary, remove the reservoir from the master brake cylinder by rocking it back and forth. Be careful - residual brake fluid may leak out. Put down the rag;
- mark and disconnect the pipelines from the master cylinder and carefully bend them to the side;
- close the openings at the pipelines and at the main cylinder to prevent leakage of fluid and the ingress of dust and dirt into them;
- remove the cylinder by unscrewing the nuts securing it to the vacuum booster;
- remove the rubber sealing ring 7 (pic. 327).
Installation carry out the main brake cylinder in the reverse order of removal, taking into account the following:
- rubber sealing ring 7, always replace with a new one;
- tighten the nuts 5 of the main brake cylinder to the vacuum booster 9 with a torque of 25 Nm;
- tighten union nuts of pipelines of a brake drive with the moment of 13 Нм;
- the push rod of the vacuum booster is not adjustable;
- lubricate the connecting sleeves 4 with brake fluid and press the reservoir into them;
- after installing the master brake cylinder, restore the fluid level in the reservoir and bleed the hydraulic drive system.
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