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Edge fractures > < Superficial cracks in cooling channel lands

A4 Cabriolet Mk2

Cracks in area of bolt connection on ceramic brake discs
Cracks in area of bolt connection on 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.
  A00-10352
Ceramic brake discs must be renewed if there are cracks in the area of the bolt connection on the brake disc extending into the friction surface of the brake disc -arrows-.
The brake discs must be renewed on both sides of the axle if:
t  renewal is necessary because of brake disc wear
t  there has been a technical modification to the replacement brake disc (indicated by changed part number).
Always renew brake discs on both sides of axle → Chapter.
When doing so, always renew the brake pads on both sides of the vehicle → Chapter.
  A00-10384

Edge fractures > < Superficial cracks in cooling channel lands