I'm back guys. Car has been running fine since I replaced pads, rear calipers, and master cylinder. Went out of town for Easter weekend and the car sat for about 4 days. On first start-up I backed car out of the driveway and I can't remember if i was in reverse or the first time I applied the brakes going forward but the brakes groaned and felt like they had just been driven through a puddle. I did a u-turn around a cul-de-sac and all throughout the turn the brakes were groaning. The problem continued for another 1/2 mile of driving before it stopped. No problems since. Any suggestions?