Welcome to the land of 3800's
Pick up a copy of "How To Restore Your Chevrolet Pickup" by Motorbooks workshop. Amazon for $19 new or $13 used. Covers everything broadly and give a few lead as to where to find parts, etc... You'll find answers to your brake questions.
I have read most of the one ton stuff off and on and don't remember seeing this book mentioned before. Anyone else have any input on this book?