This is a tough one. Mercedes tried like crazy to solve this and never did. Here is what we have done.

Replace the front brake pads and rotors. Use the OE silver, heat resistant paste on the back and the BG dip on the front. This combination has worked. I have heard of the dealers using the BG product on the front of the pads with sucess too.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM