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Accurate yet useless. I aim to please :)
Some people have cracked these by running mismatched rotors / adapters, so the piston tilts in the bore, then cracks.
You can crack them by getting hamfisted with a metal tool, should you wish to reset the pistons before new pad time.
Howard-
No adapter, it sits directly on the fork. Using the rotor that came with the groupset. I didn't touch these brakes much since I got them. They came bled and set.
I discovered the crack while cleaning the bike. The rotor was covered in oil. Further inspection revealed that the piston is stuck and not retracting. Instead of pushing it in I took the caliper apart and pulled it out. I hoped that it's just dirty.
At least wiggle are not being difficult with the replacement. They must have seen it before.
pit
That's the most accurate explanation I've ever read.