I drove my 52 1 ton with stock manual brakes for a few years. They really are pretty good, nothing to complain about. I then switched to disc front and rear, and am glad I did.
With stock gearing, a 6 cylinder, and some common sense and forethought you will be fine with the stock brakes.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-