911 Carrera (997) F6-3.6L (2006)
PCCB friction surface damage
Replace brake discs if there is associated friction surface damage > 1 cm2 -arrow-. To do this, please observe the relevant information.
Evaluating surface roughness (Sr) (max. 80 micrometer permitted)
Information
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An increase in surface roughness impairs smoothness of braking (rubbing, shaking in steering wheel, scraping noises) and increases brake pad
wear.
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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)
PCCB surface roughness (Sr) = 6 micrometer (view 2)
Surface roughness (Sr) = 6 microns -see illustration- (view 2)
New brake disc. Illustration is used to enable better classification.
The early stages of roughness are indicated by burnt-out carbon fibers on the surface of an otherwise intact, semi-matt surface.
The surface feels smooth.