thinking about brake upgrades... (1972 5500)

[GMCDumpTruck72]

Hello fellow heavy haulers! So ive been working on a 1972 GMC 5500 (ill post some pictures in a reply in a bit) and have been having lots of trouble with the brakes. The hydrovac system died on me and Im going to have to replace it, but i wanted to know what everyone else was doing since in the future im thinking about swapping to disk brakes mostly because I know how to work on them better. Braking has felt really stiff on this truck though and I just wanted to get others opinions on what they think I should do for upgrading/modifying the brakes if I were to go that route at some point.