I have to back up down a hill and around an island dodging trees so I probably pumped them 20 times. Another factor might be the fact that I have ABS. I'm not sure if ABS systems use more air or not but I do have two dump valves on the dash. About 30 minutes after I parked the rig I heard the air system fart...almost (but a softer sound) like when you depress the brakes. Is that normal as well?
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