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I have no doubt that there are cases when a hot rotor measures differently in terms of run-out than when it's cold. I have typically driven mine hard just before pulling the wheels so they were at least quite warm.However, many knowledgeable people will say that "warped" rotors are a myth entirely. (I guess they've never looked at rears after someone got them good and hot then parked with the handbrake on!) They insist that it is always hot-spots and/or material deposits on the rotors. Perhaps they don't consider measurable run-out well beyond factory specs to be "warped" (I do), or they don't believe that causes the symptoms attributed to warping. (on which they may be correct since turning the rotor also eliminates or reduces the other conditions.)
I have no doubt that there are cases when a hot rotor measures differently in terms of run-out than when it's cold. I have typically driven mine hard just before pulling the wheels so they were at least quite warm.
However, many knowledgeable people will say that "warped" rotors are a myth entirely. (I guess they've never looked at rears after someone got them good and hot then parked with the handbrake on!) They insist that it is always hot-spots and/or material deposits on the rotors. Perhaps they don't consider measurable run-out well beyond factory specs to be "warped" (I do), or they don't believe that causes the symptoms attributed to warping. (on which they may be correct since turning the rotor also eliminates or reduces the other conditions.)
