1989 Chevy Truck Desperate help needed

I have a 1989 Chevy Silverado 350 4x4. I have rear ABS. I replaced both the brake booster and master cylinder on my truck. I have all new brakes and lines all the way around and new rubber lines in the front. The front brakes were bleed with no problem. I go to do the rear with my vacume pump and I get nothing but fluid and air. I went threw 2 large containers of brake fluid trying to get the air to go away and it don't. My truck wont pass inspection do to excessive pedal travel. Im stuck and need help