Re: Brake cylinder and warning light etc...
Boosters need about 13" of vacuum. Decell creates the most, but only until speed/idle catch up. Brake light only comes on with parking brake set and a leak in an axle set.
Underneath the master cylinder on the frame, is a portioning/metering valve with a tan wire going to it. Dsiconnect the tan wire and see if BRAKE light goes out. If it does, then the valve is set to one side - blocks off the non-working/leaky side.
The valve should have a notched stem sticking out towards the front about a 1/4 inch. If not, open the opposite bleeder and push hard & quick on the pedal to reset the rod to the middle.
Suck on the booster with a hand vacuum pump, and no brakes applied, it should hold vacuum until pedal pressure is applied - opens up the atmoshere valve inside the interior to move the rod forward into the m/cylinder.
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...