on a bmw, you are right and i thought that was true for all cars until a certain sl with a clunk in the left rear when changing direction. the wheel and hub would move, but the screw was missing for the rotor and it didn't move with the hub. install screw and clunk was gone. that was 10 years ago and i still locktite those things in bmws, mbs and volvos. and so it goes, chuck.