I've had little to no brakes since I have gotten my truck so today I put a new mastercylinder on it, I bench bleed it put it on my truck went to bleed the front brakes and got no air or fluid at all in the front, what would cause that? Now I went to the back brakes and got plenty of fluid just not in the front breaks.. any ideas?

 

Bad hoses or a problem with the proportioning valve.

First check the master cylinder pushrod adjustment. If it's too long then the intake port is covered.

 

bad hoses, they rot from the inside and plug up. I have had to change them on a few vehicles that I have owned.