Medium and Heavy Trucks
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Morning Mat let me see if I can assist here
The air pressure reading on gage is only from one air tank and each one of your tanks are separated by a one way check valve, the check valve can be located on outside of tank or inside of tank, If a check valve fails your gage reading can be good but air pressure to buzzer signal may be low causing it to stay on.
Also note each air tank is separated internally so each tank is actually two tanks.
start by installing Schraeder valves in both sides of each tank (click here) ,, tee them in so you can leave in place for later use or to use for filling tanks,, find the tank that is lower on pressure than the others, then if you have external check valves between tanks replace the bad check valve, if you don't have external check valves and a tank has one side reading higher than the other the tank needs to be replaced.
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