I just wanted to take a moment and add how well the original brakes perform. I put my 54 4100 back to original and it has the best brakes of any vehicle in my fleet. That includes my modern vehicles. Even with 2 tons in it, it still outperforms all my other vehicles in braking.
Yes I wish it had a dual master, but I have had dual masters completely fail (1981 F100) - since I experienced that I put less credence on having a dual master. Instead I periodically go over the entire braking system - very easy to do since the truck is easy to get under. I check master cylinder level before every outing.
I have only once needed the safety of a dual master in 40+ years and is was because no one kept an eye on the rubber brake lines (1967 camaro back in 1978).
