Master brake cylinder with reservoir: 1 - main brake cylinder; 2 - reservoir of the main brake cylinder; 3 - tank cap; 4 - brake fluid level sensor; 5 - connecting sleeves; 6 - piston pusher
Tightening torques:
- Brake pipe fittings - 14 Nm
- Brake master cylinder nuts - 18 Nm
Removing
- disconnect the wire from the negative terminal of the battery;
- disconnect the contact connector of the brake fluid level sensor in the compensation tank;
- with a large syringe or rubber bulb, remove the maximum possible amount of brake fluid from the compensation tank;
- remove the injection computer in the engine compartment;
- disconnect the fasteners of the power steering reservoir and move the reservoir to the engine;
- remove, by pulling up, the compensation tank from the main brake cylinder, taking measures to collect the escaping fluid;
- clean the junction of pipelines with the main brake cylinder from dirt. Remember or mark the location of the piping. Turn off connecting union and disconnect pipelines from the cylinder;
- take measures to protect against the ingress of dirt into the openings of the brake system;
- unscrew the two nuts securing the vacuum tube;
- unscrew the two nuts securing the master brake cylinder to the vacuum booster;
- remove the brake master cylinder.
Figure 7.19. The main brake cylinder supplied as spare parts: 1 - the main brake cylinder; 2, 4 - plugs; 3 - sealing ring; 5 - fastening nut
Spare Parts Brake Master Cylinder (with two outlets for a conventional system and four outlets for a system with ABS). Supplied with seals, plugs and fastening nuts.
A repair kit of parts for the main brake cylinder is not produced, therefore, if the cylinder is damaged, it is replaced with a new one with a mandatory replacement of the sealing ring (Figure 7.19).
Installation
Figure 7.20. Pusher length adjustment: X=22.3 mm; the arrow shows the adjusting bolt of the pusher
- check distance X before installation (Figure 7.20). It should be 22.3 mm. If necessary, adjust the size with a bolt;
- clean the seating surfaces of the connected nodes;
- install a new sealing ring on the rear end of the brake master cylinder;
- install the cylinder on the studs so that the pusher enters the cylinder cavity to the required depth;
- screw the fastening nuts onto the studs and tighten them to the specified torque;
- attach the pipelines to the cylinder body according to the marks made;
- lubricate the rubber seals with brake fluid, then press the union of the expansion tank into them;
- perform other operations in the reverse order of removal;
- add brake fluid to the reservoir and bleed the air from the brake system drive.