Removal the master brake cylinder
The brake master cylinder is, to a certain extent, the main element of the brake system. It is located at the rear left of the engine compartment and signals the brake calipers and wheel cylinders to begin braking. More detailed information about its design and operation can be found at the beginning of the chapter.
Shown here is the safety clip (arrow) for the left-hand handbrake cable. To release the handbrake cable, bend the safety clip. Use a new safety clip when installing.
Unscrew the cap of the brake fluid expansion tank.
Suck the brake fluid out of the expansion tank.
Remove the feed pipe to the clutch slave cylinder from the brake fluid expansion tank.
Unscrew all brake pipes on the master cylinder. Be careful, brake fluid will leak out!
Tilt the expansion tank slightly and remove it from the master cylinder.
Loosen the master cylinder/brake booster screw connection.
Remove the master cylinder from the brake booster.
Slide the brake master cylinder with a new sealing ring onto the pins on the brake booster, tighten with new self-locking nuts (22 Nm).
Install the brake pipes and tighten to 16 Nm.
Lubricate the new gaskets with brake cylinder paste 90 295 751/19 70 505 and insert into the brake master cylinder.
Place the expansion tank on the master cylinder and install the clutch slave cylinder feed pipe.
Fill with brake fluid.
Bleed the brake system, check the tightness of the connections.
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