Brakes problem
1991 Plymouth Acclaim Front Wheel Drive Automatic

The back brakes act like the a shoe is either loose or broken onthe drivers side rear. It locks up on me after i put on the brakes . But my real problem is getting the drums off is their something holding them on ? i have sprayed the studs with lube and beat on the drums . I cantell that they are free from the studs but still will not come off. I am guessing maybe the pads have worn a groove inthe drum making a lip that i cannot get over . I backed off the pads as far as i can through the adjustment on the back with no luck. Any ideas?