1988 Tracer I call 'Jinx'

Hey, I got major questions for you gear heads.

I'm just a little old 17 year old girl trying to get her first beater up and running. I have a 1988, 4 door, hatch back Mercury Tracer. So far I've replaced (and when I say 'I've' i mean my step dad) a water pump, all new belts, and a transmission. Now I'm confused on my breaks.

The car is front wheel drive, 4 liters, auto transmission. Its my front right break that refused to release!!!! I've replaced the calliper and the rotor on that side and the breaks just wont release for me. the other side works fine and they share the same break line so i know it cant be in there.

I dont know anything about cars yet but I'm hoping somebody out theres knows what else I can try. If i havn't given enough information out about it i'll gladly provide more if you tell me what you need to know.

THIS GIRL MISSES HER BABY! I want to drive her back out on the road again!