"Takes two pumps of the brake pedal to get good brakes."
You will be thoroughly bleeding the brakes after replacing the master cylinder, then "set up the brakes", and I think that problem will go away. Don't forget there's a bleeder on the hydrovac.
There's different size mater cylinders because the brake slave cylinders at the wheels vary in size, as well, due to axle weight rating variations, or maybe who made the particular axle/wheel/brake setup used on your specific truck.
Also, it wouldn't be uncommon for the hydrovac to be leaking brake fluid, either, into the engine's air intake. Take the vacuum hose off of the hydrovac and note if there's any wetness/brake fluid inside of it.
Also, it's a good time to check/clean/replace the hydrovac exhaust filter, likely cleverly hidded up behind the driver's step, or possibly behind the seat.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil�s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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