What a pain in the rear this truck has been. Original complaint: Stand on the brakes with little to no stopping power. I performed complete brake overhaul. New master cylinder, wheel cylinders, shoes, seals, turned drums. Brakes were a little better after but still having to stand on the pedal. If carrying a load (4000lbs) no brakes at all. I originally put brake fluid in the master cylinder and bled the brakes. Then I found that somehow the hydraulic tank supplies hydraulic fluid to the master cylinder?? I am not familiar with this set up so I am looking for some help here. I pulled the hose that supplies hyd fluid to the master cylinder. While running, I just get a trickle of hyd fluid coming out. Should there be more pressure? Could there be a problem with the inching valve/master cylinder? Will it hurt to have hydraulic fluid pushing against the brake fluid? Any help is greatly appreciated.