911 Carrera (997) F6-3.6L (2006)
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Bores (perforations) in brake disc friction surface
The coating on the PCCB brake discs arises as a result of a high load and high temperatures, for example on a racing circuit. Check the following in
such cases:
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Ventilation (brake cooling): all components are present, secured correctly and undamaged.
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Brake pad quality: use the appropriate brake pads if the vehicle is being used on a racing circuit.
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Perforated bores -see illustration- in the brake discs must be free. Expose them if necessary.
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The brake discs can still be used even if there is a coating on them provided that they are OK with respect to all wear criteria. The perforated bores
-see illustration- must be free.
Note on bedding in the new brake pads
New brake pads require a slightly longer bedding-in period for PCCB brake discs than cast iron brake discs.
In general, the following applies: New brake pads must be broken in (bedding-in period), their optimum braking effect is therefore not reached until
after a few hundred kilometers. The slightly reduced braking effect must be compensated for by increased pressure on the brake pedal. The same also
applies after a brake disc change.
Checking PCCB brake discs (wear assessment)
Visual inspection of the surfaces of the brake disc friction surfaces (indication of wear)
Information
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The friction surface changes occur due to material fatigue as a result of extremely high thermal load. These disc temperatures, which occur above
all in racing conditions, cause a progressive material fatigue.
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Effects on driving: The surface change worsens the smoothness of braking, decreases the disc strength and increases the brake pad wear and
therefore makes a precautionary parts replacement necessary.
The following illustrations (PCCB brake disc wear appearance) are to be used for damage assessment.
PCCB brake disc wear appearance
1. Friction area surface after normal brake load in road use. No surface fractures.
PCCB brake discs without surface fractures
