A bunch of breaks/suspension questions!

ChrisSlicks

Basically correct. The cracks occur from the expansion and contraction of the rotor. Unless well cooled just about every rotor eventually cracks eventually under track conditions, even blank faced ones. The drilled rotors crack a little more quickly because the area around the holes is a weak spot, and the heat fatigue is particularly bad around the center of the rotor face.

Driving on the street you will probably never see cracked rotors even with drilled ones. Maybe if you did a lot of hardcore canyon carving that was able to heat the rotors to track temperatures, but it would have to be hard and frequent.

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