BMW 21521104510 Input Cylinder Clutch

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On many models, the clutch and brake fluid reservoirs are combined. With this design, syphon out some fluid until it falls to the minimum level and then disconnect the feed pipe to the clutch master cylinder. On later models with independent clutch and brake reservoirs, either syphon out all the fluid from the clutch reservoir or disconnect the feed pipe to the clutch master cylinder and drain the reservoir completely. Disconnect the pipe which runs from the clutch master cylinder to the slave cylinder. Depress the clutch pedal several times to expel fluid from the clutch master cylinder. Working inside the car, disconnect the clutch master cylinder pushrod from the clutch pedal. Unscrew and remove the clutch master cylinder mounting nuts which are accessible within the car and withdraw the unit. Prior to dismantling, clean all dirt from external surfaces. Peel back the rubber boot from the rear end of the clutch master cylinder and extract the circlip. Withdraw the pushrod assembly, piston and spring. Wash all components in methylated spirit or clean hydraulic fluid - nothing else must be used. Examine the surfaces of piston and cylinder bore and if there are scratches, scoring or 'bright' wear areas evident then the clutch master cylinder must be renewed complete. If the components are in good condition, discard all rubber seals and obtain the appropriate repair kit. Install the seals using the fingers only to manipulate them into position and then dip the components in clean hydraulic fluid before installing into the cylinder. Installation is a reversal of removal but bleed the clutch hydraulic system.