I think it has something to do with the pads. My car doesn't have that noise 'til recently when I have my pads changed(and I have the same situation as you have. Noise only heard when light braking). My guess is that MB uses Metallic Pads, which produces more noise then normal pad.

Andy Kuo

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• 1992 Mercedes-Benz 400SE
  
• Pearl Grey/Black Leather
  

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