The maximum brake pressure I can get without the brake booster is 500 PSI. That's basically standing on the pedal and using the steering wheel to pull me in.Thank you.
I think I need to get a brake pressure gauge and map out the pressure vs pedal location.
I hate reinventing the wheel but I'm looking at all options, and a more reliable air/hydraulic 2 circuit master cylinder seems like a good research project..
There is a formula for calculating stroke and bore size to pressure and all that jazz, and I don't think I'll be able to get to that high pressure unassisted without a 10' long brake pedal, heh.
So, for now, I guess I'm researching 2 separate things. Replacing the air/hydraulic system, and an emergency/parking brake... The shaft mounted one from what I hear is crap, even when it's working properly.
I've been eyeing shutoff valves, different master cylinders, and a whole bunch of stuff to see what might work.
I'm not really sure what you're trying to do here. There is already a dual brake master cylinder on the later Deuces that works great. Going with a more modern brake booster would make it more reliable. Or just replace the whole system with a totally modern Hydraulic system that utilizes a hydraulic pump like the larger Chevy trucks have.