I have done nothing to the overall system for 20 years, other than two rounds of air shock replacements (most recently last week, somewhat preemptively, but I suspect a possible small leak). It’s been shockingly reliable for me.
I know this hasn’t been the case for many others. In view of my experience and how I like the way the car drives with the air springs, I even opted to keep the system despite having the rear end pulled apart recently to put a lift in. I had considered a spring replacement kit.
I did read that there is a guy on this board who manufactures a rebuild kit for the compressor which people have used and seem to really like. I might tackle that this fall or winter. 20 years out of a compressor seems to me to be pushing it perhaps?
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