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Brent Regan is absolutely right about the propensity of MIL-H-5606 fluid
to absorb air.  His suggestion to put it to a light vacuum is right on,
unless you have a lot of time for the air to out-gas voluntarily.

Re the use of DOT 4 (or DOT *) brake fluid.  Don't do it!  O-rings come
in a pretty wide variety of "rubber" compounds, and a variety of
hardnesses (Shore hardness).  In-service performance (swell, hardness,
etc) is affected by the compound/fluid combination.  Standard hydraulic
design practice (with -5606) uses rings of Buna-N with a specific shore
hadness.  It's been 12 years since I retired from engineering and I can't
call the Spec numbers for the rings from memory.  I'll try to get with a
younger GenDyn (now Lockheed/Martin) engineer this week and post the
numbers.
Dick Alden

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Please send your photos and drawings to marvkaye@olsusa.com.