Okay, while the backend was apart on my recently acquired 1982 300TD, I had the rear hydropneumatic shocks replaced (the old ones weren't leaking, but were in bad shape).
Having recently bought the car, I haven't actually experienced the 'joys' of a self-levelling rear end(!).........I did notice today that with the engine running and my wife sitting on the rear tailgate floor, the rear end did drop.........Am I missing something? Yes, the oiil reservoiir is full, and no, there are no leaks.......if the pump isn't working, how do you know......errrr.....I assume the rear end sags?? Can anyone shed some light on this please!