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Well you open a lot of variables, if the truck is loaded you prob would want more brake force on the back. However if you never put weight in it, would it matter.... prob not... I bet you could find a new/used one without too much trouble.

The foot control valve is operated by the brake pedal (5) and receives pressurized air from both the primary and secondary air tanks. The foot control valve is a dual activation design, with one set of ports supplying air to the front brakes from the secondary air tank and another set of ports...

Appears to be a load sensing valve...

pic didn't post hang on...

I have seen this switch but didn't pay much attention to it yet, keep us informed of your progress, I am out of town too so can't take a look either. thanks