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Old 01-05-2002, 01:34 PM
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Join Date: Jul 2001
Posts: 44
W126 Self Levelling Rear Sags Overnight - Springs or Controller?

Hi all...

84 380SE with Self Leveling rear.
The rear sags quite low overnight (wheel arch slightly covering tire), also the "whistling" sound from operation of the relief valve (in the level control unit) are evident sometimes. Height is restored about 1-2 mins after engine starts.
After researching on the forum and MB CD-ROM, I come to the following initial conclusions on one or combination of the following problems:

1. Mis-adjustment of the connecting rod on level controller.
2. Faulty Level Control Valve.
3. Sagging Springs.
4. Collapsed Differential/Sub-frame mounts.

The following are my thoughts:
If the differential/subframe mounts have collapsed, this should only cause slight sagging and perhaps interfere with the level controller.

The whistling noise indicates opening of the relief valve, and therefore level is continuously regulated too high. Perhaps an attempt to raise height by adjusting connecting rod by previous owner.
The sagging seems to be caused by sagging springs as well as a partially faulty level controller, which allows oil pressure in struts to drop beyond basic pressure. Because if spring only is at fault, height would retained by the pressured struts. But if level controller only is at fault (low/no pressure in struts, springs not sagging), would the springs alone be able to hold the car up at normal level (or slightly below)?

Please respond and any comments are welcome.
Thank you in advance for your help.

Best Regards,

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Old 01-05-2002, 09:37 PM
Registered User
Join Date: Jun 2001
Location: oregon
Posts: 194

Is the load leveling suspension an option for this car? I have an '85 380 se,I dont think I have load leveling?

our 82 300td (wagen) does.
It rides very stiff in the rear,and it also sags while parked.
I have read from this site that it may need "nitrogen spheres" to fix the stiffness?
that may have something to do with the sag also.hopefully someone on the site will know?
'60 190b
'77 300D
'78 240D
'82 300TD
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Old 01-06-2002, 12:05 AM
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Join Date: Jul 2000
Posts: 638
sagging cause

The rear end on the 'self leveling' MBZ should not settle overnite at all. That means the height control valve is not doing its job and is leaking internally. Rebuild or replace it.

The 'stiff ride' is caused by flat nitrogen bottles (Air Cells)
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Old 01-10-2002, 09:02 AM
Posts: n/a
On my 230te I had a similar problem with sagging.I replaced the spheres and now it stays up all night and the ride is transformed.I would not start to fiddle with the level adjuster as it goes to the right height after driving so it is a pressure drop problem which goes back to the spheres!!

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