I have a 2001 Chevy S-10. My front brakes keep locking up on me. I have changed the Master cylinder and the wheel speed sensor which made the ABS light go out. After it sits for about an hour the brakes release and I can go again. I unplugged all the power to the ABS block because I was told that it may need an ABS block but if I unplug it and it still happens then that is not the problem. I did that. Still locked up on me. Any suggestions?