My Rear Brakes stick because of my master cylinder, I think. I drove around the neighborhood (testing) and after hitting the brakes several times my rears eventually lock up! If I relieve the pressure at the rear master cylinder valve it frees the brakes up. So I bought a rebuilt master cylinder but no matter how I bled it it would not give me any pressure, plus I had to swap the lines around for the front and rears. I took the rebuilt back and put my original back and am thinking of getting a brand new master cyl. Has anyone had this problem? I saw a couple other posts on rear brake drums that are locked up,,this could be your problem. Thanks for any help