I have power brakes on mine, but they were installed by the PO. Sorry I can't be more helpful, but they do work nice. I also have disc brakes on the front. When I bought the truck the brakes were fair until I realized the booster wasn't getting enough vacuum. I switched the line to a different vacuum port and what a big difference it made.
Joe

54 Triumph TR2(rhd)needs total resto.
60 Apache 10 stepside shortbed
99 Excelsior Henderson