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      04-13-2012, 05:35 AM   #2
M3SQRD
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Drives: E92 M3s,R56 CooperS,F22 228iX
Join Date: Jun 2009
Location: EC

iTrader: (2)

This is a common noise and not an issue/problem of any kind with your car. The M3 uses drum brakes for the parking brake, not the rear brake calipers/rotors. To prevent corrosion/rust build up on the drum and shoe pad material surfaces you need to regularly clean the surfaces by applying the handbrake (lightly) while driving.

If you want to test this the next time you park, on a flat surface, do not apply the handbrake and then see if your car makes the noise when you "stand up/sit down".