Dave
soaking that part of the rotor in evaporust will remove the rust,but it involves removing the rotor. There are brush on rust neutralizers that would work if left on over night. Once you decide what to do, use LPS or boeshield on that part of the rotor to preserve it. Depending on how many miles are on the brakes, you may be replacing the rotors soon. Most German cars rotors are throwaways with each brake job.
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1971 W30 convert, triple green,second owner.
1971 W30 Convert, special order Rally red, completed
68 Camaro Z28,Corvette Bronze,Houndstooth
2016 Porsche Carerra Cab and 2021 C63S AMG ,modern fun.
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