Checking release bearing with mechanically attached plastic ring

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2007 Audi S4, 2007 Audi RS 4, and 2006 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Release Bearing With Plastic Ring Attached

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Identification: retaining tabs around plastic ring - arrows -.

The release bearing must be replaced if the plastic ring - 1 - has come loose.
The release bearing - 3 - must be replaced if the groove - arrow2 - worn on the plastic ring - 1 - is deeper than 0.8mm.