I reckon in normal riding the brakes don't get hot enough to be a problem. But if your riding style or terrain means you're on the brakes hard - they're probably getting hot - that's when you don't want to sit stationary with them applied.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge