2000 Cavalier rear brakes stick

Hello, I have a 2000 Cavalier, 2.2 L, 103000 miles, and I have had a brake issue for months now that I can't seem to figure out. When coming to a stop, the rear brakes seem to grab. The rear of the car squats and they make a squealing sound. The brakes seem to stick at this point. When I take off from the stop, I hear a loud pop and the rear of the car raises up as the brakes release. I temporarily remedied this by under adjusting the self adjusters but that only lasts for a short time. I have replaced the rear wheel cylinders and shoes. Any ideas?