911 Carrera Cabriolet (997) F6-3.6L (2007)
Worn surface. Advanced wear has led to a situation where only the remains of the original surface are left.
It is clear that the roughness is caused not only by depressions but also by bumps.
Replace brake discs! To do this, please observe the relevant information Replacing brake discs (notes/decision-making aid).
In general, the following applies: Brake discs must be replaced if the surface roughness (Sr) is > 80 microns!
3. Worn brake discs (special cases):
3.1.
Surface roughness (Sr) = 108 microns, as in the case of the previous disc, but with the remainder of the original friction surface -arrow-.
Replace brake discs! To do this, please observe the relevant information Replacing brake discs (notes/decision-making aid).
In general, the following applies: Brake discs must be replaced if the surface roughness (Sr) is > 80 microns!
3.2.
Surface roughness (Sr) = 72 microns. Borderline disc, identified by the roughness, but also by the indication of wear and associated surface
fractures -arrows-, > 1 cm2.
Replace brake discs! To do this, please observe the relevant information Replacing brake discs (notes/decision-making aid).
Checking brake discs for minimum thickness
Note:
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For perforated brake discs, the minimum thickness -x- must always be measured on the inner or outer friction surface track -arrows-.