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I'm having 27K miles in my '13 335i with standard (non M Sport) brakes and I'm thinking to swap the pads out with Cool Carbon's Street/Track pads and wondering whether I should resurface the rotors during installation or not. The rotors are totally good, are not shaking at all, but tiny concentric lines can be seen and felt when touched on the surface. Would it affect the breaking performance with the new pads if I left it as is or shall I just get it resurfaced? I'm attaching photos of the front and rear rotors, hopefully the "depth" of the lines can be seen.
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