Okay so I pressed my brake pedal while my left rear brake drum was removed. I had no idea of the consequences and now I"m dealing with some shoes that won't budge. They're expanded and it seems nearly impossible to put the drum back on! I read that I have to replace the Wheel cylinder, but how do I tell if it damaged and no longer usable? And what steps can I take to fix it, please help I'm going nuts trying to fix it!