I've done a search but couldn't find an answer to this so apologies if it's been covered before.

I parked my car up in off-road mode and when I returned to it a short while later one of the front corners had dropped right down suggesting a leak. Is the system completely sealed or is a slight leaking to be expected once the ignition and therefore compressor is switched off?

If so, how long for a drop would be acceptable? I mean, if I left the car for a month then I would expect some dropping to have occured, however an hour or so seems to suggest excessive leaking.

Having not had a car with air suspension before I've got nothing to compare it against.

i dont have any drop, was park for 2 weeks while on my hols, all ok V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

Any drop noticed by eye is too much, especially after just an hour.

but you sure your range rover didnt just level itself, it comes to life to do this now and then. 2004 black Vogue TD6

Fairly sure it didn't just level itself. One corner was noticeably lower even though it was parked on a flat and level surface.

soapy water it is then........  2004 black Vogue TD6

Would suspect a leak which isnt normal. Could be a bag gone, air line or valve block. Most common is a leaking bag. It can't be to bad as the compressor is keeping up with the leak when running. I guess you don't have an air suspension inactive message on the dash as you got the car to off road height. Take it back to the dealers and push for 2 new struts. Sounds like 1 is goosed but good safe practice to change an axel pair Or that's what you should insist on.

No warning lights and the car rises at a reasonable rate so smallish leak seems most likely.

Some phone calls to make in the morning.....

Update:

I took it to a local independent this morning and they found a hole in the NSF strut. It must be growing as the front of the car now sits right at the bottom and you can see it dropping as soon as the ignition is off. It's booked in to be replaced next Wednesday.

That means I can't drive it for a week as I don't want to overload the compressor.

On the other hand all work has been confirmed as covered under warranty.

Are they doing both? I would press them for both if you can on safety grounds.

I tried but unfortunately it's not strictly a safety issue as the sides are linked so deflation of one will cause deflation of the other. He said the other one was in good condition so perhaps it has already been replaced.

Interestingly he said that he had changed hundreds of OSF ones but only ever 4 NSF.

Perhaps the air bag in itself is not an issue, but it has an integral shock absorber, and they should always be changed in pairs - at least thats what I was always taught

I didn't realise that the shock absorber is integral to the unit. In that case I'll push for changing both sides.

Thanks for the advice.

Yer there shocks with like an air doughnut round them. Same where in the US you can buy replacement airbags to go on the original shock, there are varied reports and not that much of a saving. Push for both to be done as there £350+/- per corner without labour.