New answers tagged pneumatic
This, at least as far as my experience goes, is used simply to create extra friction in joints; to make something poseable yet stiff and able to hold its position. Sorry no pic, but a good example is the 8996 Scorpio XV1, a walking machine that uses these to keep the legs stationary unless you actually want to move them.
I was going to recommend lubricating the pistons, but seeing you already did exactly that, I can only say you should try to isolate the source(s) of the problem. Since you have at least one working cylinder, the compressor and the feed tubes should be all right. This leaves the following possible points of failure: switches, subsystem hoses, working ...
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