Here's a long shot - check the parking brake. When I replaced my rear rotors the inner parking brake surface of the new rotor must have been a few thousands of an inch smaller which created a cyclical scuffing sound from the parking brake shoe dragging on the inside of the rotor. A minor parking brake adjustment eliminated the noise.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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