There's also a dump valve. Did you heck if it's leaking? As you know, the 2 circuits, left and right, are separate so if both sides are sagging, look for a common cause.
I would drop the compressor/valve block to check it more thoroughly. It's only 3 nuts once you get the splash shield off.
The compressor is only intermittent duty and will fail quickly if it runs too much.

 

Thanks. I haven't dropped the valve block or compressor yet. I will have to check the dump valve as well. I had a spare brand new Arnott bag in the garage just to rule out any bag issues. Damn bag was defective out of the box. Had a crack in the top plastic. I have some days coming up to look deeper. If I disconnect the 3 bolts can I drop everything enough to soapy water test? Even the top? This is a difficult leak to find. The right side is the first to show a dropping issue but I see the left side seems to drop a bit as well. This makes me think it might be a common leak point like the dump valve. I've had that splash shield off and on again 5-10 times at least. Definitely an annoying thing to trace.

I don't see a dump valve on Realoem.com. Where do I find it?

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Hmm, I don***8217;t have thIs issue yet, but I know it is probably coming in not a distant future. Range Rover YouTube /forum have a lot of info on air suspension troubleshooting. also, just an idea, measure the height of each wheel arch before and after to see exactly left/right or both sides are impacted

 

I know this system pretty well now. I’m beginning to think it is only a right side issue but has a slight impact on the left side due to lowering. After 5 days now it seems the left has adjusted a bit to the right but is not really leaking. The right is looowwwwww. Left is almost at the appropriate height. This might rule out a “common” failure for both sides. I just warrantied out my spare Arnott bag and am waiting for it in the mail. I plan on replacing the right side bag and then submerging the old right side bag in water (sealed at the air connection) to see if somehow it was damaged beyond visual or hearing detection when the air pipe was originally perforated. I think the compressor and dump valve would cause a pretty equal side leak. This, in my mind, leaves the valve block and bag as the only suspects.


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Sounds like a reasonable plan. I don***8217;t remember whether this issue developed overtime or after air bags replacement?

 

New bag didn't solve it 6 months ago but I also found a hose perforation after installation months later. Idea is that the bag prematurely failed again. Or was damaged beyond observational damage at the same time as the pipe.

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Problem solved. I removed the bag again from the side that was falling. I elongated it and was able to find the smallest of leaks when I submerged the bottom half of the bag in a bucket of water. My air pipe repair was always fine so I didn't really need to replace the air pipe. This will be the second bag I warranty out this week. Area of the tiny leak pictured below.

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