Quote:
Originally Posted by elh0102
Sorry, I thought I did. If pad material is subjected to heat significantly beyond its design parameters, then it no longer transfers in a uniform manner. If you rub a stick of butter on toast, it comes off very evenly. If you try to rub in on the surface of a hot pan on the stove top, it pours off, and will then solidify in chunks as it cools. Of course, the "chunks" on a brake rotor are thousandths of an inch in thickness, but still there. At least, that is my understanding of it, and seems to be supported by experience.
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Thats called brake fade. The pad can have full contact with the rotor, but the pad will no longer have "grip" or "resistance" against a rotor. Thus the car doesnt stop.
http://en.wikipedia.org/wiki/Brake_fade
http://en.wikipedia.org/wiki/Disc_brake
Scroll down to;
Disc damage modes