"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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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