Air Suspension leaking

[suprteck]

I have noticed that my front suspension goes down after sitting for a long time. It’s been in service and they found nothing wrong. I went into the service ride menu and looked in the body section and there is a measurement for air suspension reservoir pressure. I noticed it builds up pressure to about 16 Bar then the compressors stops. And just sitting there doing nothing it is slowly dropping all the way to 2bar after 30mins or so. I was wondering if anyone can check to see if this is normal.

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[Donald Stanfield]

Not normal in 30 minutes. Mine doesn't even run every day unless I'm changing suspension modes.
Doesn't run let along sag.

 

[suprteck]

Not normal in 30 minutes. Mine doesn't even run every day unless I'm changing suspension modes.
Doesn't run let along sag.

If you go into the service ride menu can you see what the normal reading is for the reservoir pressure.

 

[CrazyOne]

Mine sags on one corner in 24 hours. Compressor runs. It's been like than for an year. I will probably open ticket for next scheduled service.

 

[R1Thor]

Seems like there have been efforts to 'standardize' testing of the suspension.

Put your vehicle in off-road mode - > Set to highest -> Service Menu -> Tire Change.

Put a piece of masking or painters tape taught across the gap between your tire and the body of the truck.

If it remains taut over time, it's good.

If you start getting slack in it, you have a leak somewhere (not good: open service ticket).

 

[suprteck]

If you put it in tire change mode this isolates leaks to the airbags. But what is there’s a leak on the other part of the system on the tank side. I don’t think the leak I have is in the airbags. I have an ultrasonic leak detector hear at work and will see if I can find it.

 

[Joe Hoffman]

My compressor runs frequently when driving but does not sag when parked.
Service says it’s “normal”.
I’m not convinced.

 

[sherold]

My driver's front spring will typically sit 1-2" lower than the passenger side after sitting parked overnight. It will also slowly leak down several inches over several days if not driven. I opened a ticket, the service center inspected it and said the system is "well within spec" after sitting over the weekend. Its been operating like this since day #1, after 22K miles has not caused any issues, has not gotten any worse, and I do not see it as detrimental to the vehicle in any way. The suspension relevels itself at the first stop after I start a drive

Do I think it should do this? No
Am I going to waste excessive time correcting a minute "issue" that is causing no harm? No

 

[Mathme]

I have a similar experience to what @sherold describes. In 22k miles of driving, mph front suspension will be at different heights when the truck sits overnight - I mostly attribute this to the fact that my parking space at home is not level. When I start driving, the truck will level itself and if the suspension is too low, a warning will be on the driver display. When I left it at home sitting while on a 2-week vacation last year, when I came home, the truck had settled down on all four corners.

My previous car was an Audi with Air suspension and it would behave similarly when parking. In fact, it would often spend a few moments trying to level the car in the parking space.

I last drove my truck yesterday afternoon and here you can see it is lower on the driver side than the passenger side as it is leaning toward that corner. You an also see from the side that there is more space between the top of the tire and the wheel well in the rear than in the front (as this follows the general slope of the driveway. Even when parked on a level space, it is common for it to be a little lower in the driver-front corner over night. I've considered this normal behavior. Here's the pics:

 

[suprteck]

I’ve got confirmation from another Forum member that their pressure stays at 16 Bar. Mines has a slow leak somewhere. Just scheduled an appointment for May

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