I went through a long ordeal with the dealer with a similar issue. After driving for an extended period of time, there would be a grinding noise when breaking from one wheel. Had it back to them at least 6 times. They did everything including turning the rotors. In the end, they finally discovered that one of the rotors had a very imperceptible crack that would only become a problem when the rotor became hot. For many cars, the price difference between turning the rotors and new rotors is small... these days, I usually insist on getting new rotors rather than having them turned.
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