OK you metalurgists, I have come across and unusual patter on front disc brake rotors. The metal on the inside of the front rotors is very rusty and falling off in chunks. The outside of the rotors looks normal. The cars will make a faint scraping sound but the brake performance seems normal although the rotor surface looks terrible.One vehicle had 54k miles original nissan rotors and the other was aftermarket premium rotors, lasted 4 years then all of a sudden started to show this same pattern. I have checked the slides and everything is free, pistons are free,calipers bleed multiplt times, both pads show same type of wear but the inners are wore much more. Look at the pictures and see if you can explain what is happening. I have a guess that the rotors may have been multiple layers of different metals and when the surface metal is gone the underlaying is soft and not up to the stress.
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