Does the noise occur after the car is stopped, while the body is settling? Or does the noise occur just before the car stops moving? My car made a similiar noise in the latter case, and it turned out to be brake pads just at the wear limit combined with rotors right at minimum thickness. New pads and rotors solved the problem for me. If you have the first case problem, maybe a suspension bushing is worn and something is grinding and resonating through the body panels.

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E