911 Targa 4S (997) F6-3.8L (2007)
PCCB surface fractures
No replacement necessary as the associated surface fractures are < 1 cm(2)!
3. End of service life of friction area surface or after highest load on a racing circuit.
Replace brake discs if there is associated friction surface damage > 1cm (2) -arrow-. To do this, please observe the relevant information.
PCCB friction surface damage
Evaluating surface roughness (Sr) (max. 80 micrometer permitted)
Information
An increase in surface roughness impairs smoothness of braking (rubbing, shaking in steering wheel, scraping noises) and increases brake pad
wear.
With a roughness (Sr) value of > 80 microns (> 80 micrometer), a precautionary parts replacement is required.
The assessment is carried out visually, based on the diagram. Two illustrations of the same peak to valley surface roughness (views 1 and 2) help to
make a better assessment.
1. Brake discs that are OK:
PCCB surface roughness (Sr) 6 micrometer (view 1)
1.1
Surface roughness (Sr) = 6 microns -see illustration- (view 1)