Beyond Belief...
True....I've seen it into the cooling fins too, but usually those cars are in the junkyard. One thing though, and that is.....once it gets to metal-on-metal, things start wearing fairly fast. You know how people are......wanting to "make it" til payday......and keep driving their cars to work all week.
I remember my wife would mention to me that her Astro van's brakes "sounded funny for the past day or 2".......shoot, in a day or 2, those rotors were smoked!.......I mean done!