Hello all, I am at the end of my ability. I have a 1998 chevy tahoe, and both front brakes are engaging. It all started when I left the lights on and the battery died. I got a jump, and the vaccum booster failed. I replaced that, and than the brakes started to lock up. I replaced the master cylinder, to no avail. could it be an ABS issue? I had the calipers checked, and replace and bled the lines...

Any help would be great. Thanks in advance