Rear suspension sag

[Saundersbronco]

Hello all I have a 2008 Expedition limited with the air suspension. The rear sags when it’s parked. The first time it happened the compressor was bad. I changed it and it stayed up for a while. Then one day I came out and it looked like a mini truck in the rear. I started the car the compressor came on and it went back up. It rides perfect when I’m driving I can tow stuff and while I’m driving there compressor doesn’t come in at all. When it’s parked or I don’t drive it for a while it drops. I recently changed out all of the air lines and it still sags. Any suggestions?

 

[zfifty]

Sounds like the air spring bags or O-rings are bad and leaking. Spray some soapy water on and around assembly and connections to check for air leaks.

 

[Saundersbronco]

Update: a few months ago I replaced the bags and the air lines and things have been great. The other day I drove to work and the check air suspension sign came on. I came out to the parking lot at lunch and the back end was completely down. I replaced the compressor and now it runs for 15-20 seconds and the check air suspension sign pops up. I disconnected the air lines from the bags to see is it would run longer and same result. I disconnected the line from the compressor and it ran for 15 seconds and it shut off again. Any suggestions?

 

[Saundersbronco]

I just swapped to coil suspension I didn't want to bother with it any longer