Dont worry about it. All disc brakes will slightly rub. Disc brakes do not have return springs. If a problem developes where they are not releasing you wont have any problem knowing it.
Originally Posted by eyemansfm
Normal condition. All disc brakes drag very slightly
Originally Posted by Jrsess
Does the same thing with the disc on your car!
Originally Posted by bmaier
Yep, all disc brakes have a very slight drag to them, even on cages
Yep, what they said. It's normal. Not HD normal. Normal normal.