How many miles have you had on it? And do you remember exactly which retailer or supplier did you buy those from?Hi
I spent almost 2 years to find several noise and air leak in my Air suspension , changing them with a china version very low cost , changing the Height sensor , take care of all sensor , you may have corrosion on the connector it self after 10 years usage.
By the way, finally I change with a brand new Bilstein front Air Suspension ( they use dunlop or Delphi depending ) direct from germany , It's a miracle all noise disappears of course the rear suspension are bilstein too.
The results is perfect with this kind of shock , of course the price is almost double than china version but it works now...