Quote:
Originally Posted by shertex
That's interesting. If in fact the car is driven virtually every day, is it a safe assumption that the only way for that rust pattern to develop is a malfunctioning caliper?
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Yes, even on a daily driver with a working caliper, the rust ring will grow. Remember, once the surface rusts and gets rough, it sands the pad down faster than the pad wears on a smooth surface preventing it from rubbing the rust off. Once the rust progresses more than 1/2 way, the pad tilts and makes full contact but by that time the rust is so well established it won't wear off.
If the caliper piston on a opposing piston caliper was stuck, the rust would extend the entire width of the rotor surface on the stuck piston side.