turbo/superchargeing, what about brake servo vacuum etc. . .

[sumo_e36]

As above. when you turbo or supercharcharge a N.A engine what do you do about the vacuum fed ancilliaries (brake servo etc...) are there electric ones on the market

[Brianmoooore]

There's still the same manifold vacuum, when you close the throttle, which is the usual state when you use the brakes!

[boombang]

they use a one way or "check" valve on the vaccuum hose

[sumo_e36]

is that the definitive answer then, you leave it as it is

[boombang]

Depends if it has a one way valve in already or not - if you do then yes.

Alternative is to either switch to pedal box with master cylinder appropriate for non-servo assisted braking or as you said running another vaccuum source (which I can't say I've seen unless you were to adapt a diesel type, some cars it is on the alternator, others driven off an engine belt)

[Brianmoooore]

Depends if it has a one way valve in already or not - if you do then yes.

AFAIK, all vacuum servos have a one way air valve!

[Turbo-Brown]

Pedal box or not, there will still be vacuum in the manifold when the throttle's closed.

Seems that pretty much every car has a one way vale so just leave it as it is.