When I brought my beast home from Stanwood only one of the rear drums worked, and only on one of the two cylenders. Fronts were rusted solid. Such a small amount of fluid was needed it explains why the brakes worked at all with a dead booster and a leaky master.
Most of them are still available new, NAPA definately has them as I had to go into the 60's trucks to find parts for my '56. It does make a big difference on who's workn the counter, my local shop has some guys that know those books VERY well.
Front brakes and master are easy enough, back end could depend on what's on it. I replaced my whole system with the exception of the rear cylenders, those I just honed & rebuilt. NAPA here in Oak Harbor had everything I needed, most of it in stock.
Shoes and drums are an issue, the good news is you can have the shoes relined.
I had my park brake (drum on back of trans) shoes relined thru a local truck shop for a reasonable price, you can also get some help for the odd items from the local tractor shops too.
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI
I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P