i am working on a brake job on a 47 (early) 1 1/2 ton. it looks as though the stock system is the way to go. my hydro vac drum seems to be bad as the pedal is sucked to the floor with the engine on. i have seen some posts about a split master cylinder (front/rear) and that sounds like a good idea. i plan to have my local mechanic do it because things are sooo rusty and i like the idea of professionally done brakes. tell me what you know!!!