Quote:
Originally Posted by 97 SL320
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.
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... nah. I've put rotors on that are totally rust caked, and with properly operating caliper, the rust is polished off in about 40 miles of driving. if he changes the caliper, the rotor will look shiny and new in a few days of normal driving.