On second thought, replace the rotors. What I have learned through the years, MB, BMW, and Audi have very agressive brake pads which will eat the rotors up. If you stick new pads onto used rotors, the new pads will eat up the rotors to a very minimal thickness and could cause vibration problems or brake fade. Error to the safe side, replace the rotors.

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Experience: Where the test is given first and the lessons are learned later!