The brake hoses on these trucks often fail internally. They act like a check valve and don’t let the brake release. If you have experienced this on one wheel, replace ALL of the rubber lines in the system. There might be 3 (with rear drum brakes - not sure if this Subby has disk rears) or 5 - one at each corner and one in the middle of the axle. If one has failed the rest are close behind so just do all of them.
Carefully check the metal brake lines as well because these lines tend to rust apart right near the ABS unit. A full line set is available for a few hundred and a clever mechanic can replace them without dropping the gas tank and leaving the old, disconnected line in place.