Originally Posted by Bloodweiser
The rear brake is fairly worthless. I use it only as a parking brake when stopped on hills. Even still, just curious about the heat - I'm don't know too much about these new fangled "disc brakes" and consequently don't know how much heat/drag is normal.
One way to check the drag is to ride the bike around for about 10 min while not using the brake in question and then pull over and check to see if it is warm or hot to the touch...Just be careful in case it's hot!
It should not be more than cool to slightly warm if it is working properly.