YOU ABSOLUTELY NEVER CHANGE THE BRAKE ROTORS WITHOUT CHANGING THE PADS!!! (pad cost is minimal; dealer is being petty). It is the worn pads which are damaging the new rotors, and they will continue to do so until they are R&R. Get the to another dealer, as the one your using doesn't know his A$$ from that hole in the ground!

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A good pessimist is never dissapointed!