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BTW, autocrosses are only for about one minute per run, and almost all of them keep you below 60 MPH. It's very hard to overheat your brakes at a typical autoX.
Track days can do it pretty easily, since you're braking from much higher speeds (remember, the energy you're dissipating goes up with the square of the speed!) and the typical run group is 20-30 minutes. Your brakes get very little chance to cool off.
People who live up in the mountains can see pretty warm brakes. Especially those who like to drive aggressively in the mountains.
If I were living up in the Rockies somewhere, I might actually think twice about using wheel covers that allow no air-flow. If I were going on the track, I would not use those type of covers. But otherwise, I don't think it's a problem.
-soD
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