Originally Posted by bigjae1976
Maybe its me but that looks like it came off a car rotting in a junk yard for the past 30 years.
That's what happens to the rotor surface after many high heat cycles from heavy track use. The issue is not the rotor surface but the cracking of the rotor hat. I'm not sure how often those are supposed to be replaced or if they are supposed to be replaced at all. It just seems odd that they would crumble like that.