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Superficial cracks in cooling channel lands > < Assessment of ceramic brake discs

A4 Mk2

Visual characteristics of ceramic brake discs
Visual characteristics of ceramic brake discs
On these models (8E and 8H), ceramic brakes are fitted only at the front.
Checking area of bolted connection on friction ring and brake disc hub:
  WARNING
Brake disc ring and disc brake hub are bolted together and must NOT be separated. Do NOT slacken bolt connection on disc brake hub.
   
Due to the production process there already are relaxation cracks (varying degrees) on the friction surface of the brake disc when it is new.
  Note
Relaxation cracks on a ceramic brake disc do not constitute a technical problem.
Even on new brake discs relaxation cracks may be clearly visible, and their size can vary.
  A00-10354

Superficial cracks in cooling channel lands > < Assessment of ceramic brake discs