Reread what I posted. It has nothing to do with reading the the thickness of the rotor, it has to do with the rotor being so worn out the edge of the rotor cuts the wire.
If I'm wrong, then I'm wrong, but this is what I have read from a very well respected Porsche parts seller. I didn't just pull it out of the air.
That makes sense, my old rotors were worn pretty bad and they had a major lip on them. And it is right at the top of the pad. It would have to be a heck of a worn rotor.
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