my benz w220 s500 03 drop within about 2 hours in rear left side, I replaced before front suspension with refurbished and until now front can hold for even few days,

airmatic valve replaced many time and finally I cleaned and reassembled from few months ago just last two weeks car droping just rear side, specially left, i expect airmatic valve but before i open for replacement i checked the rear strut copper valve at top of strut, i remove the hose while car in good height that time it drops fast hence air flow from strut fully, 

this copper valve is it functioning as one way direction?

or it pass air similar to my case when hose removed?


I forgot to mention that i have replaced the rear both strut with another used strut with looks good condition except the cooper top valve release air when hose removed

Do you have a scanner that can read airmatic system. You have a leak and could be the line to that rear airbag or the airbag itself. 

No I didn’t have,

is it linked to airbag system? 

Or you mean strut, i change yesterday the airmatic valve with other one, i test it before fixing it work fine on 12V DC but when assembly to car it kept low,

i have cleaned the old valve and fixed back later i will see if it drop or not

Ok got it, do you have any idea about the copper valve at top of strut, is it one way air flow? 

Because when i remove hoses, air released and car drop  on that side.

if it is one way i have to replace all,

i have use WD40 in to clean airmatic valve and now car level holding for long time 

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