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Seriously Ben,
If you figure this out - even if you have to have a local handyman help you weld up a modified vacuum booster - this could be your big contribution to EV conversions. You could supply these bad boys to conversion types pretty easily. If you figured it out on a metro and for a S10, you'd have most of the EV conversion market covered. Plus, if people don't have engines under the hood, they'd have plenty of room to mount up your booster/master cylinder unit in other types of vehicle.
Oh I wish I had a shop. I'd grab a booster from the Pick-A-Part tomorrow and get on this. An "air over hydraulic" setup - where you actually have a mechanical linkage present for backup.
I can store 10 atmospheres in a tank pretty easily - but you can only store one atmosphere of vacuum. That's the huge advantage. You could regulate down to 10 psi of line pressure and probably get significant use out of the thing. If not, a pressure switch turns on a small pump and spends a few watts to get you back up to pressure. Air compressors that guys use for airbagged suspensions on cars are pretty affordable and built to make 150 psi or more. Plus, that market would be an easy source of 5 to 10 gallon tanks - which, you have plenty of room under your hood for.
This is the type of thing that Mullet or Schultz could bang out in a jiffy.
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