Withdrawal
Use a syringe to remove some of the brake fluid from the reservoir of the hydraulic drive.
Disconnect the flexible hydraulic clutch hose from the reservoir and plug the openings of the hose and reservoir.
On the model «323i» remove the fuel injection mixture regulator.
Unscrew the nuts securing the master cylinder to the vacuum booster, as well as the nuts securing the cylinder bracket to the wing mudguard.
Remove the cylinder bracket. Disconnect the pipes from the cylinder and close the openings at the pipes and at the main cylinder to prevent fluid leakage and dust and dirt from entering them.
Remove the master cylinder.
Installation
Check up a condition of the rubber ring providing tightness of connection of the main cylinder with the vacuum amplifier, and replace it if necessary.
Install the master cylinder and its mounting bracket to the mudguard «snout.
Attach the pipelines to the main cylinder and tighten the cylinder nuts.
Connect the clutch fluid hose to the reservoir.
Bleed the brake system to remove air from it.