My experience with "pure" cork material has mostly been with valve cover gaskets on '60s-vintage cars. The cork would eventually become saturated all the way through with oil -- and that's not a high-pressure application! I don't recall any bad leaks, but those gaskets eventually got very black and brittle; little pieces broke off very easily. So, I probably wouldn’t use that stuff on a hydraulic system if I could avoid it.
There is also what I would call a cork-rubber mix; you can see the pieces of cork interspersed with pieces of black rubber or vinyl or whatever it is. I used this type of gasket with good results (again, not on hydraulics), but due to the aforementioned experience with cork I coated both sides as well as the edges with a VERY light skin coat of silicone (to keep the cork from absorbing/transporting any oil). But again, that was no high-pressure application, and I don't know how the gaskets would have fared without the silicone.
Silicone itself is good stuff and can do the job, but I would try to use as little as I could get away with. Once you crank down on those bolts, it’s surprising how much of that stuff squeezes out of the joint – inside and outside. It’s tough, rubbery stuff, and even the smallest piece that gets loose inside can raise Cain with valves and orifices.
I think I would probably try one of Permatex’s non-silicone products first (I don’t remember which one, maybe it’s Permatex #2). If a piece gets loose it may not cause quite as many problems as a piece of silicone could.
You may want to bounce the Permatex idea off someone at the auto parts store or a local hydraulic shop. Whichever way you decide to go, please let us know what you do and how well it works.
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