help with a brake issue

[tonystarks]

I just changed my brake master cylinder and still have beyond spongy brakes! I can hear a little bit of air coming from the booster and get absolutely no brakes. I also tried to cross bleed my brakes and I get absolutely no fluid coming out of the rear brakes. any ideas? Could it be the brake lines? If I have to change my brake booster do I have to remove the dash? I looked at tsrm but it doesnt say anything about the dash and am curious? Also, when I put the brake master cylinder on I didn't bleed the cylinder, well my budddy said that it was not necessary, so i said fawk it and just installed it and tried to bleed my brakes. i'm getting ready to camo my beast and its making me want to blow this bad boy up! any help would be great guys and gals