I have a 2003 Ford Excursion with 256K and when I was backing out of the garage it felt like I hit a car. I tried to pull forward but it would not. I gave it about 50% power to get it back into the garage. Took the brake assembly off the passenger rear and disconnected the cable. I hit the drum portion and the rotor and it loosened slightly so I could rotate it with a pry bar. It still will not budge. What else can I do?