Have a dump truck with two auxiliary axles. the up and down air switch messed up on one and its on backorder so we hooked everything up to work off of one switch. the axles raise and lower and the pressure regulator is work and the guage is reading pressure, but the axles dont have any pressure pushing them down. with them down, using the brakes causes the tires to lock up and skid. any ideas on the problem, by the way, the manufacture of the system is hendrickson

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