Contact Freightliner's help line ; with your chassis serial number ( VIN ) and ask for an air system diagram , and your chassis build date.
There is a PPV ( Pressure Protection Valve ) that isolates the suspension system from the supply tank ; to save air pressure for braking , should an air suspension bag rupture .
The PPV maybe stuck closed .
Your suspension dump air solenoid , if leaking and not allowing the suspension to come up to ride height should be producing an audible air pressure leak and noticeable lower reading on the front air gauge.
Freightliner help line .
1-800-385-4357
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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