I have a 2002 S430. At 25000 miles I needed all new pads and rotors (rotors rusted). At 45000 miles I need them all replaced again (rotors again rusted). Most all mileage was highway miles. To top this off a "new" special tool is needed to do work so only Mercedes garage can do it. Anyone out there know what my brake problem is - is it auto design flaw? Thanks