Otherwise known as the "air spring" or the "rubber bellows around the shock absorber" or the "****ing rubber bastard with the leak".
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You can try, but you have the chassis / airbag mounting and UCA which largely blocks your entire view of the comp.
https://uploads.tapatalk-cdn.com/202...a12526ed24.jpg
I've never done the valve, but you can definately do the compressor without touching the strut at all.
Potentially. The valve is quite long and has to withdraw out straight, not to mention getting to the circlip holding it in. I just poked the camera around and figured if you were going to do it, removing the upper arm and airbag would make it easier.
It's all theoretical really as given the difficulty of getting in there you'd be better replacing the compressor.