Use a syringe to suck out the working fluid so that its level is below the fluid supply nipple to the clutch master cylinder.
Unscrew the fitting of the working fluid supply pipe from the working cylinder.
Clutch slave cylinder: 1 - working fluid supply pipe; 2 - nipple for bleeding the clutch hydraulic drive; 3 - locking pin
Remove the slave cylinder retaining pin.
Remove the slave cylinder from the gearbox housing.
Disconnect the working fluid supply tube from the working cylinder and plug the openings of the working cylinder and tube.
Install the clutch slave cylinder in the reverse order of removal, applying consistent grease to the thread of the piston pusher connecting bolt. Bleed the clutch hydraulic drive after filling the reservoir with working fluid.
(The original source of the article can be found on the website: AUDImanual)