1988 300TE does not self level with load..
Car rides just fine.
Fluids all full.
Disconnected the arm from the valve on the rear suspension... moved it up and down with the engine running... nothing happens.

I did search but could not find any other diagnostic tests without pressure test equipment.

Anyone have any ideas on what could be wrong or how to diagnose it?
How do you test the pump... valve, or accumulators?

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2009 Mercedes ML320 Bluetec