read this
http://www.benzworld.org/forums/w140-s-class/1490003-pneumatic-rear-headrests-wont-drop-down.html

I always thought they were powered, like the front headrests. ???

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)