CTS V wagon
What's the consensus on micro cracks in rotors? I picked my car up from the dealership for unrelated work and they gave me my car back with a fairly dramatic warning about my rotors being unsafe because of cracks. The cracks are very small (hardly visible) and largely limited to the center of the rotors. I track the car occasionally so they've no doubt been caused by heat cycles at the track. I'm not inclined to worry about it, but, for those of you who track your cars, when do you start thinking about replacing rotors? When the cracks are pervasive over the whole rotor face? Or do you base the decision to replace them on other factors, like warping or thinning?