Replacing the master brake cylinder

As practice shows, in many cases the repair of the master brake cylinder in garage conditions does not lead to the desired result, therefore, in the event of a malfunction, we recommend replacing the cylinder assembly.

You will need: TORX T20 keys, «at 13», «at 24».

1. Disconnect the wire from the terminal «minus» battery.



2. Turn away a stopper of a reservoir of the main brake cylinder and pump out a brake liquid from a reservoir, for example, the big medical syringe.

Note: For clarity, further operations are shown with the reservoir of the master cylinder removed and the air inlet pipe removed.

3. Turn away nuts of fastening of brake pipelines to the main brake cylinder...




4....and move the pipes aside.

Helpful Hint: Plug the pipelines in any way possible (for example, by putting protective caps on the ends of the valves to release air), to prevent leakage of brake fluid.

5. Loosen the two flange nuts 2 (see fig. 9.7) fastening the main brake to the vacuum brake booster...



6.... and remove the main brake cylinder.




7. If during operation there was a leakage of brake fluid through the connecting sleeves, remove the sleeves from the openings of the cylinder body.

Reuse of connecting sleeves is not allowed, replace them with new ones.

8. Remove a rubber sealing ring from the case of the main brake cylinder.

Warning: The sealing ring of the master brake cylinder must be replaced with a new one each time the connection is disassembled.

9. Install the master cylinder and all removed parts in the reverse order of removal, Fill in brake fluid (see «Brake Fluid Replacement»).