The SL does the same thing, loud in reverse only with light pressure. My brake pads were done by my indy many years ago, so I have no idea as to the brand.

__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!