Hey, Holly,
I also have a '59 Apache Fleetside. For brakes, I got one of those basic kits that adapts mid-'70s GM Intermediate wheel bearings and disc calipers to the solid-axle spindles. It was not expensive at all. I got all the mid-'70s disc brake stuff from Auto-Zone - really cheap! I used a mid-'70s dual master cylinder from Auto-Zone (cheap) behind an 8" booster and installed them in the stock location beneath the floorboards with a fabbed-up bracket (you can buy one as well). I played around with flexible brakes lines and got a pair that were planty long to deal with future front suspension ups and downs. New steel brakes lines complete the installation. Oh, yes, I added Wilwood residual pressure valves to front and back circuits.
It was all very inexpensive!
