Vehicles with manual transmission:

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Pull cover cap off clutch slave cylinder bleed screw.

Fig 1: Connecting Filler Hose From VAS 52.4 Or V.A.G 1869 To Adapter

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Place extractor bleeder hose - 1 - on clutch slave cylinder bleeder screw, open bleeder screw, and let about 100 ml drain out. Close bleeder screw and install cover cap.
Operate clutch pedal several times.