I have been having a problem with my rear brakes locking up. At first they were really dirty, so i cleaned them up and they were ok for a couple weeks. Then, it started again. I replaced the shoes, and found a bad wheel cylinder. Replaced that too. Worked good for about a week and a half, and started once again. Now I have just replaced the springs, and adjusters and it is still doing it. Ok now here's the kicker, its not constant. Sometimes it doesnt do it at all. Last night it was so bad, I could hardly get out of my driveway.... Any input or info is greatly appreciated.