I would rebuild what you have and add a vacuum booster to improve the feel. There's not a lot out there for the bigger trucks and the booster and a dual res. master is what I did on my 1 1/2 ton. Now I can actually get the brakes to lock-up with a load on if I so desire.

Welcome to the 'Bolt neighbor,
Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!