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Check the lines that go between the quick release valves and the hubs they dry rot

Rear wheel valves slip up and off all the time. The fronts leak where the line comes out of the hub going to the valve. I double up on the o rings there.

You should get a pressure check on startup when the air tanks reach 120psi. If the system starts filling and you go below 120psi in your air tanks the system will stop filling till it sees the 120psi again. Does the in cab hiss sound like air flowing or is air leaking into the cab from the...