This is a copy of a post from Sept.12, 2014. My 97 Nissan d21 is doing this also

What is your question?

I have a 97 Nissan pickup. 2wd 4 cylinder 5 speed. I changed 2 brake lines because one had a hole in it and was leaking a lot of fluid and the other was rusted pretty bad. The lines I changed were from the front to the rear and from the middle if the truck to the rear. After bleeding them I still have no brakes and I noticed the master cylinder was leaking some fluid out of the back. Bought a replacement master cylinder, bench bled it and put it on. Now I bleed the brakes again and still no brakes. What am I missing? I've used almost 2 quarts of brake fluid in this whole process so I don't think there is any air left in the lines. It seems when I bleed the r/r (to start) there is continuous air. using vacuum bleeder and no leaks that I can see in bleeder or brake system. HELP!!!