>> It's not 20 mm of cast iron though. Each side has a thickness of, say,
>> 6 mm so you are wearing a significant proportion of that. Also, what is the
>> maximum travel of the pads?
I experienced that, when I bought a car that I susbsequently found to have had its discs skimmed. Travelling at speed down the A2 to a roundabout, the brake pedal hit the floor.
A caliper piston had come out so far it wedged sideways, causing slight pressure on the pad. The heat generated boiled the brake fluid.
Quick fix in a lay-by was new pads and fluid bleed, about an hour. New discs fitted when I got home.
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