Went out yesterday to to bleed and adjust the brakes on my 52 GMC 3/4 Ton with stock huck brakes. 1 yr ago i completely rebuilt the brakes. New lines,hoses, wheel cylinders, pads, master cylinder... everything!!! Bled the brakes and adjusted and they have been working great ever since. I noticed that I had a small air bubble in the one of the lines, as I could every now and again feel it in the peddle. So I went out with my grandpa yesterday to bleed the brakes again and re adjust, due to it being time. Bled the back brakes first, no air out of the passenger rear, and a tiny little air bubble out of the drivers rear. Im sure that was my culprit. Next moved to the fronts, bled, and bled and bled.... and bled the brakes. Ran 2 huge bottles through it. Got air and fluid out. Now I have NO PEDDLE AT ALL!!! What in the world happened??? I have absolutely no leaks in the system ANYWHERE! The only thing I can think of is the master cylinder pooped out. But why all of a sudden. When we were bleeding we never let the master cylinder run dry or even half empty. But all we are pumping out is tons of air and fluid. Looked at all my wheel cylinders and they are all fine dry as a bone. Any suggestions. Or is my 1 yr old master cylinder shot?