My mate has a few super cars with ceramics and he has learned that you need to stand over the tyre fitters and make sure nothing is allowed to chip the disc with prior agreement that the garage understands what they are dealing with, he had a nasty experience and now uses one garage who agrees that if they chip them then they replace them.

Funnily enough the same bloke had a taurag v10 tdi and loved it, he only changed it for a Porsche biturbo 4x4 cayenne. I assume that is the same engine in the towrag as the Audi?