...Take a look at this:
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for a good link! For normal street sinners, this might be a good advice; [excerpt]:
"...never leave your foot on the brake pedal after you have used the brakes hard.
This is not usually a problem on public roads simply because, under normal conditions, the brakes have time to cool before you bring the car to a stop
(unless, like me, you live at the bottom of a long steep hill).
In any kind of racing, including autocross and "driving days" it is crucial. Regardless of friction material, clamping the pads to a hot stationary disc will result in material transfer and discernible "brake roughness". What is worse, the pad will leave the telltale imprint or outline on the disc and your sin will be visible to all and sundry."