what bike is it ?the problem is proabaly the brakes as you say the salt on the road causes a big build up of corrosion behind the dust and piston seals in the brake calipers and the pistonn/s in them do not retract when the brake is released.try turning the wheels one at a time with help from someone holding it over for you.is the rear brake disc or drum ?
adam bike doctor, February 2009