Originally Posted by LarDasse74

I can think of three possible problems -

1. When the brakes were disconnected the cable housing moved out of one of its stops and this is impeding cable movement
2. THe wheel is not mounted 100% straight and not allowing the brakes to fully close
3. The brake cable is slightly tighter than it needs to be.

Solutions:
1. Trace the cable from the handlebars down to the brake, checking closely at each point where cable housing stops and bare cable comes out... look for any places where the housing does not seem to be in a cable-stop correctly, and correct it. THis usually happens at the brake lever. You may need to release the brake at the wheel again to get enough slack in the line to correct the housing issue.
2. If the cable housing is seated properly in each of its stops, check that the wheel is mounted properly. With the bike upright on its wheels, flip the quick release open, push the bike down lightly to ensure the axle is fully seated in the dropouts, then flip the QR closed again.
3. IT is possible that there is no problem - the cable is just slightly tighter than what allows easy brake connection/disconnection. Look at the brake lever - there is a barrel adjuster there and if it is screwed out from the lever body at all then screw it in a turn or two. If the barrel adjuster is not screwed out at all you only need to loosen loosen the cable anchor bolt on the brake arm, slip 1 or 2 mm of cable through toward the lever-end of the cable, and re-tighten the anchor bolt.