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Original post by: Derek929 ,


With the engine off and the tag axle up, you should not lose any air pressure.  When you put the tag down, you are using air pressure from the tanks to keep it on the ground.  If the truck loses air with the engine off, and tag on the ground, you have a leak somewhere.  I would start by checking the air bags on the lift axle around both the bells with soap and water, then I would check the air ride valve for leaks also.  If the air leaks out when the truck is off and axle on the ground, then the leak is in the air system for the tag axle.  Hope this helps