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New brake rotors are often covered with an anti-rusting “oil” to prevent the iron in the rotor from rusting before use. It appears it either wasn’t uniformly applied or it’s worn away with time. You should use something like Brakleen (brake clean spray) before using the rotors. I find it extremely odd that the rotors were all delivered in one box without each rotor being in its own box. Where did you order these from?
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