Quote:
Originally Posted by nico_rsx
Rotors don't warp. That's almost a myth.
Maybe solid rotor, but ventilated rotors (like all front rotors, and the twins rear) are almost impossible to warp. They will crack before warping.
The feeling of warp rotor is almost always pad material not evenly transfered on the rotors because of overheating, or appliying the brake when stopped, or a craked rotor.
Bad transfer layer can sometimes be corrected by bedding-in or "turning" the rotors.
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Almost a myth is correct. Pretty hard to warp a car rotor since it has to be heated up extensively and very quickly. Even the hardest track braking doesn't do it fast enough so as you said they crack instead.
We make pick up truck (and some car) rotors where I work and every couple of months we get a set of badly warped vented rotors sent back for warranty investigation. They are always the front and the dealer documents usually start with "customer was going down a large hill pulling a heavily loaded trailer and noticed a pulsing in the brakes right after". Conditions like that can warp them pretty badly.