If it were me I would find the latest model truck with hydraulic drum brakes front and rear and the dual hydrovacs like you want of the same or higher GVW and copy that system. I am sure that the manufacturer put way more time and money into the engineering than we could ever hope to.
HL I have seen and worked on a lot of medium and heavy duty truck braking systems from hydraulic too air and have never run across a load sensitive system for the rear that is a new one to me.
My old 57 Kenworth had no front brakes and still had the brake limiting switch on top of the dash for bobtailing in the rain. Those limiting switches were band and shortly after brakes were required on all axles.
The rear brakes on both my 56 and 64 two tons are a good four times the size as the fronts
Last edited by HevyHauler; 05/27/2008 2:39 AM.
