They tend to give you some warning before failure - slow to reach pressure set point which will raise errors relating to the suspension operation. In these cases it's worth refurbishing the things with the kits.
If you are not getting these sorts of problems at the moment then possibly little to be gained by installing the kit but probably worth chasing up a kit as a spare so you can get on to when it does occur.
If you do get symptoms of failure but ignore it then the problem can progress to cylinder and bore damage at which point the compressor becomes a throw away item.
2024 RRS on the road
2011 D4 3.0 in the drive way
1999 D2 V8, in heaven
1984 RRC, in hell
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