21 52 500 Removing and installing/replacing clutch master cylinder

Necessary preliminary tasks: 

• Remove trim panel  for pedal assembly. See 51 45 185 REMOVING AND INSTALLING/REPLACING PANEL FOR PEDALS .
• Remove microfilter housing  on left. See MICROFILTER .
• Remove light module  . See 61 35 285 REMOVING AND INSTALLING (REPLACING) LIGHT MODULE .

Fig 1: Identifying Supply Hose Of Clutch Hydraulic System

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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 Spring

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Disconnect spring (1).

Remove retainer (1) using screwdriver and press out pin.

Fig 3: Identifying Retainer

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

Detach hydraulic line from clutch master cylinder.

Fig 4: Identifying Retainer

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Remove lock (1) from pin with aid of screwdriver (2).

Lever out pin (3) with aid of screwdriver.

Remove clutch master cylinder.

Installation: 

Replace pin.

Press in pin until lock (1) can be seen to snap into place.

Fig 5: Identifying Pin And Lock

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Detach supply hose (1) from clutch master cylinder.

Fig 6: Identifying 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: Identifying Plug Connection And Shift Element

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Installation: 

Shift element is secured against incorrect installation.

Fig 8: Identifying Shift Element

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Shift element must snap audibly into place.