Without PCCB
WM 46 Technical data/Brake wear limit - 911 Carrera 4STechnical data wear limit - 911 Carrera 4S
Depending on the wear of cast iron brake discs, two condition criteria can make replacement necessary:
1. Cracking in the holed (perforated) brake disc friction plates is in an advanced state.
2. Brake disc minimum thickness is not attained due to wear (material erosion due to friction).