Brake drum removal HELP

I don't know if this applies to your situation but have you opened up the bleeder valve to relieve any pressure that might be built up? I say this because I just had a drum that was frozen on my right front on account of the brake cylinder being full of rust inside and acting like a one way valve. When I stepped on the brakes it pushed the shoes out but the pressure would not release unless I opened the valve. The drum was totally locked up. When I opened the valve the drum came right off.