Brakes locked up. Need help!

Yes, I have taken the master cylinder loose....pulled it about 2 inches away from the booster, and all four corners stay locked. It kinda sounded like a master cylinder problem to me as well, but I'm not really that much of an experienced brake guy. I have not looked to see if the piston was all the way back out, but I will check that first thing when I get home this weekend. Been building this car for 2 years, and right now the brakes are the only thing keeping me from being able to drive it for the first time!!!