Maybe someone remembers this old Clark braking system. It uses hydraulic pressure from the steering bypass to actuate the brakes. From what I can see it only has 2 hydraulic lines connected to the "master cylinder"/valve.
The problem is that the master cylinder/valve fades. It will slowly travel to the floor though it will give you a little braking on the way down.

I left the dealership just before this truck came out so I have absolutely no information on it. Apparently this truck wasn't a big seller because this is the first one I've seen. Anyone have any information on this system, or an idea on why the pedal fades?
Thanks