[SPRHK]

Check to see if the pistons in the calipers are moving freely. Depending on the way the bike was maintained, if the brake fluid hasn't been changed,you could have crud built up between the seal and caliper housing. This causes the piston to stick and not retract properly. Its an easy fix if you are mechanically inclined. You would need to remove the calipers, use an airhose to pop out the pistons, carefully remove the seals , and thuroughly clean the seals and pistons. If the seals look iffy, replace them. You should also replace the copper gaskets for your brakelines if you take it apart.
Do you feel a vibration, or pulsation. Vibration usually means that the brakes are dragging, pulsation usually means warped rotors. Good luck with it and let us know how you make out.