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keep in mind also that the m/c does NOT apply the brakes. it only controls the air regulator on the air pack. also talk of a proportioning valve simply does not apply when you have all drum brakes. so it comes down to this: you need 2 air packs and a way to control the air to them.

what we need is the casting #, not the part number. i used the pedal and valve assy from a 900 series truck, mounted on a reinforced firewall. (along with the air assist hydraulic clutch) air packs are from a nissan UD box truck, the rest is just plumbing.

yes same air packs the air packs would not move the same stroke, they would only move enough to apply the same pressure . in the control valve the pressure from primary MC is balanced against the air pressure on the other side of a piston, controlling the air pressure to the apply piston, and...

well since i don't think anyone really knows this yet, find someone with a air force truck with dual brakes and have them get the casting number from the MC. it had to come from somewhere and if it has a number should be tracable.

keep in mind that when the system is working correctly, the MC does NOT apply the brakes. it only controls the air pressure regulator on the airpack. it is the MC on the airpack that applies the brakes. with no air pressure and ONLY then, does the primary MC push on the piston of the airpack MC...

forget about brake bias, you have all drum brakes and it should all be the same pressure. tom, with REAL power brakes.