21 52 500 Removing and installing/replacing clutch master cylinder

Necessary preliminary tasks: 

• Remove TRIM PANEL for pedal assembly.

Unclip retaining tabs (1).

Pull cover (3) out of guide (2) and remove.

Fig 1: Identifying Unclip Retaining Tabs, Guide And Cover

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Draw off brake fluid up to supply hose of clutch hydraulic system (1). For this purpose, use only a vacuum pipe that is exclusively used for removing brake fluid.

Detach supply hose (1) from expansion tank.

Fig 2: Identifying Expansion Tank Supply Hose

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Release screws (1) on cylinder (2).

Tightening torque: 21 52 4AZ

Fig 3: Identifying Clutch Master Cylinder And Screws

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Disconnect return spring (1).

Detach locking clip (3) and pull clutch pedal with clutch master cylinder off bearing block.

Press pin ends (2) together and remove pin.

Installation: 

Replace locking clip.

The locking clip must be seated with both legs in the pin groove.

Fig 4: Identifying Return Spring, Pin And Locking Clips

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Detach retainer (1) with a screwdriver (2).

Detach hydraulic line from clutch master cylinder.

Fig 5: Removing Retainer Using Screwdriver

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Detach supply hose (1) from clutch master cylinder.

Fig 6: Identifying Clutch Master Cylinder Supply Hose

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Lever out shift element (1) from clutch master cylinder (2) with screwdriver.

Release plug connection (3) and disconnect plug (4) from shift element (1).

Fig 7: Disconnecting Plug From Shift Element

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Installation: 

Shift element is secured against incorrect installation.

Shift element must snap audibly into place.

Fig 8: Identifying Shift Element

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