Originally Posted by koala logs

Multicolored means the brake rotor would have been glowing red hot (you won't see the glow unless it's night). You might want to inspect brake pads and the brake calipers as well. On long descents where I might have dragged the brakes like due to plenty of tight turns on the way down, I just sit in a more upright posture and unzip my jersey to create as much aero drag as possible. That helps reduce my speed without depending too much on the brakes.