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It's not a good idea because the tiniest of leaks will render the hydraulic lock useless in a short time.
Exactly. And my bet is that any piston sliding in a cylinder always has a small amount of leakage past the "rings" (or in this case seals)... they didn't design it to withstand a pressure application of more than a minute or two. If it can hold for longer, great, but the mfr doesn't expect it to. And you would be thinking of at least hours, maybe days? I kinda doubt any brake system would hold with no bleed off, though I've not tried it.Just to give a point of reference, the classic test for leaking seals in a brake system is hold your foot on the pedal for a minute, see if it stays rock solid or slowly sinks toward the floor. That test doesn't mention hours or days, either.
- Erik