Mercedes Benz 300TE hydraulic rear suspension

I have a 1989 Mercedes Benz 300TE. It has hydraulic rear suspension. My fluid reservoir is empty and there are signs of a leak in one of the rear struts. My two struts are completely compressed. I used a jack and when the suspicious strut extended a bid, I saw fluid running down; is this self lubrication? Is my strut leaking?. How would you tested? What is the best way to purge the system ( i must now have air in the lines.) Thanks Luis “

The struts should be bone dry, so the wet one is certainly shot and needs replacing, and man, those babies aren’t cheap. After replacing the leaker, try bleeding it at the connection by making it a tiny bit loose, running the car, making it tight and repeating this a few times, just like bleeding brakes.