1999 pontiac montana extended van, 168,336MI. I have a problem with the brakes. The ABS and brake lights are on and the brake pedal is spongy. I got fluid coming out of all bleeders and I adjusted the rear brakes because I used to be able to spin the rear tires while applying the brakes so I adjusted them a bit now I cannot move them. But I still have a spongy pedal and lights are still on. Any Idea how I can fix this?