Is this cause for concern? This is the top of the rear driver-side (US) strut. I know the actual air bag/bladder is inside, but still wondering if I should address this asap.

Thanks!

 

Galley builds to about 190psi, compressor cuts off, and I can hear air escaping from somewhere but soapy water revealed no bubbles at any point.

 

I cant tell what I am looking at. Is this a rear strut? That looks like just an upper dust boot. But the bit farther inside does look black and dark like maybe some rubbing? You can pull on that dust boot for a better look. Dont forget to spray the very TOP of them, there is an inner seal that can fail and cause leaking out the very center top.

 

Yep, US drivers side rear. I did spray the crap out of everything around the strut assembly and saw no bubbles.

 

It might also be from the valve or valve blocks. Apparently ordering an o-ring kit is cheap and replacing them very cheap. I just ordered them from the UK from the link provided in the video and will be doing these as well. From what I've read, the air struts are actually quite durable and don't fail so frequently compared to the valve block o-rings.

Check this video from Waffle Square which sounds like a very similar issue:

Also, this video analysis in the first half of the video explains how the system works and common issues: