kmay,
You missed my point about the water entirely. The jack, being a hydraulic system, will work, and work quite well on water. It won't last long on water as any dolt would know, but it will work.
That you should not use brake fluid in a jack, the nature of whose internal seals you probably do not know, is the same reason the you should not use modern mineral based brake fluid in old style systems. It will often disolve the seals.
ps. I have been working on machinery, everything from lawn mowers to 50,000 hp marine engines all around the world, for a bit over 50 years now so I am fairly confident that I know what I am talking about. I currently operate two 2,000 ton per hour bulk ore ship unloaders that have about 1,500 hydraulic horse power each so I deal with hydraulics on a daily basis.
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