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check the ride height air valves as I suspect that there may be a problem there . When parked the valves will be sealing off correctly but when in use as in driving the constant variations may be letting more air out than the valve will be letting in to maintain ride height
Probably failed seal or air bag leaking air. Check again and try to see if this will do the trick. Sometimes pvc line could fail to deliver air to the bag too!
There are some that sit up higher than others, I have one that sits lower, but it has a lot to do with the type of shocks and suspension. It's nothing to worry about unless you are referring to the air bags not inflating. Is it sitting lower in the back or all the way around? If only in back, then the bags are not inflating, but if it's low all the way around then it's normal for some models.
yes indeed you do, after the vehicle pumped up you can get down to the rear wheel and listen for air escapes from the air bags.
if there is no air leak then you have a solenoid that let air go back to the pump
You will probably be able to find an air inflation port mounted on the rear axle near where the bags are mounted. Make sure the kill switch for the bags has not failed keeping power from going to the compressor.
IF YOU HEAR COMPRESSOR TURNING ON THATS GOOD. THE MOSE COMMON PROBLEM IS BEHIND BATTERY THERE IS A PLASTIC LINE WITH A UNION TO CONNECT THEM,THE UNION BREAKS AND BAGS WILL NOT INFLATE IN REAR. YOU CAN GET UNION AT A DEALERSHIP AND SIMPLE TO INSTALL THE LINES BACK TOGETHER,MAYBE ALSO A LEAK AT THE BAGS IF IT INFLATES AND SINKS AFTER SITTING A WHILE. WITHOUT MORE INFO THATS WHAT I HAVE TO OFFER.
Sounds like the seals may have failed in the air shocks themselves. I also think you may have a bleeder valve problem. Follow the lines back and check the bleeder valve to see if it is leaking when you have someone else turn the vehicle on.
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