Suspension dropping over a few days

[TonyC]

Hi All,
My 2012 D4 is dropping over about 24 hours.
The LH side drops to a bit below access hight, the RH side about 30-40mm higher, but still lower than road hight.

I've tried removing R7, which i think is the suspension relay, in the engine bay fuse box, it does the same thing, but I think the LF drops a bit faster than the other corners

Other posts I've found seems to be one end dropping not one side.

From posts on here from the original owner it had a FR corner valve replaced in 2016, and a FR air bag in 2020.

Where should I start looking?

I'd like to do a compressor/valve block service, but I need to work out what compressor I have.

Tony

[RANDLOVER]

The suspension will chase the lowest corner down until the whole car is on the bump stops, so it seems your leak is on the left hand side. R7 sounds like the compressor relay, which is why it can still bleed air and drop, you need to pull the 5amp fuse F35 behind the glovebox and see which corner drops.

[scarry]

Could be a corner valve,been there done that a real pain to diagnose.

Lots of threads on this issue and air leaks on here.

Do what Randlover has said,sometimes it will need to be left for two days or longer to see what happens.
I found measuring from center of hub to guard was a good indication on what is going on.
Noting that as one corner goes down,other corners would change as well.

Good luck with it.

[loanrangie]

F26 is the self leveling fuse, remove that and see which corner/end drops overninght.