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Is it a depressed groove or a raised ridge?
I have a depressed grove one of my rotors. When I brought it in they denied warranty service on the basis of once I came in with track pads which can, by the nature of the much more aggressive compound, score rotors. However, as evidenced by the fact that this occurs with stock pads as well (something I knew already but the dealership wouldn't admit to) this is also possible with a stock setup. I'm not exactly sure of the cause but my guess is that it has more to do with the pad than the rotor.
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