Quote:
Originally Posted by Matt@Camber-Toe
This. Coming from the racing scene it is normal to see rotors of this nature. Even the 15" Alcon Brakes on the GT3 RSR will start to do this after repeated use at the track. Hauling down a car from 180mph over and over is no small feat.
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One thing I will add. Cracking that catches your fingnernails or cracking that connects all the way from the edge of the rotor, or cracking that are deeper than surface cracks ARE a problem. Those will eventually develop into deeper cracks. When that happens, monitor the conditions of the rotor ring carefully and replace as soon as you can.
The cracks on my front rotor shown in the picture are visible but do not catch my fingernail and are mostly microscopic surface cracks, which is normal given the amount of time spent on very hot and brake intensive tracks here in So. Cal.