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I don't have a vacuum boosted brakes on my suburban, but if I did here is what I would do.
First off I would give the brake booster its own vacuum canister isolated with a check valve. That canister would have an additional vacuum pump plumbed into it with a vac switch set to turn the vacuum pump on at around 14''Hg.
Then I would add a warning circuit, a red light or LED (always hot) that grounds through another vacuum switch set for say 10'' to 12'' of Hg.
That way you always have power brakes or a warning light if you don't.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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