Check the free play of the parking brake lever
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
The parking brake has asbestos-free brake linings. The handbrake with asbestos-free brake linings must never be adjusted in such a way that the lining must "grind down" during operation.
The handbrake must be adjusted if the handbrake lever can be pulled up by more than 4 teeth with medium force application without a braking effect being apparent.