911 Targa 4S (997) F6-3.8L (2007)
Edge damage on PCCB brake disc
Max. permissible width/depth = 2 mm
Max. permissible length= 10 mm
Max. 3 damaged edge areas permissible
Rear without PCCB
WM 465302 Checking rear brake discs (wear assessment)
Brake disc wear assessment - General
The condition of the parts can make replacement necessary under two criteria, depending on the amount of wear on cross drilled (perforated) brake
discs:
1. Cracks in the cross drilled friction plate at advanced stage.
2. Brake disc minimum thickness is not attained due to wear (material erosion due to friction).
In practice, both forms of disc erosion occur.
Normally, brake disc replacement is necessary after the thickness falls below the minimum. In rare, isolated cases (of very high loads for long
periods) replacement may be necessary due to crack formation. To a certain extent, these cracks may be rated as not important. The maximum
permitted perforation crack length is 5 mm.
Perforation crack length is too big (greater than 5 mm)
Checking grey cast iron brake discs - evaluating cracks
No need to remove from the vehicle as the perforation crack length is small (less than 5 mm).
Perforation crack length is small (less than 5 mm)