The Hydropnumatic suspension was developed by Citroen, who licences the technology out to the likes of Rolls-Royce and Mercedes Benz...

Here is a link to a Citroen DIY guide that does explain the functioning of the system....

http://www.tramontana.co.hu/citroen/suspension/suspension.php

Its important to know, that very high pressures are used in the SLS system, and that the fluid must be the correct type and changed regularly...

__________________
http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....