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.
2.2 Superficial cracks in cooling channel
lands
Superficial cracks in the cooling channel lands -arrow- are caused
during manufacturing.
Note
Superficial cracks in the cooling channel lands do not constitute
a technical problem on the ceramic brake discs.
2.3 Cracks in area of bolted connection on
ceramic brake discs
Checking area of bolted connection on friction ring and brake disc
hub:
WARNING
The brake disc rotor and the brake disc hub are bolted together
and must NOT be separated. DO NOT slacken the bolted con‐
nection on the brake disc hub.
Audi A6 2005 ➤ , Audi A6 Avant 2005 ➤
Brake system - Edition 04.2019
2. Assessment of ceramic brake discs 7
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