I replaced all 4 of my rotars at 70K if that helps you.. I'm a pretty aggressive driver I guess! the minimum thickness of the rotars are actually stamped onto the disc.. (on all cars as well)
it is easy to replace also.. just remove the brake caliper and than a hex screw holding the rotar down.. Gilly you think if the ml320 had drum brakes would the stopping power be better? I really dislike my ml's braking power =/

Attached Thumbnails