What vacuum psi pressure does a brake booster require?

[fxshov]

I put new new dual carbs on my 71 bay. No port for the brake booster is supplied. I'm not drilling and tapping a hole in my manifolds. I want to add a separate vacuum pump. Does anyone know what vacuum psi the brake booster requires?
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GOOD AINT CHEAP AND CHEAP ANIT GOOD

73 Bay Window
05 Tundra
12 Scion
93 HD Softtail
18 NX 2500
I need a bigger garage.

[skills@eurocarsplus]

-18 to 22 in Hg
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[fxshov]

thanks
_________________
GOOD AINT CHEAP AND CHEAP ANIT GOOD

73 Bay Window
05 Tundra
12 Scion
93 HD Softtail
18 NX 2500
I need a bigger garage.

[SGKent]

it better be a big vacuum pump to be able to refresh after a couple brakes. Probably will want to add some kind of a reservoir to keep the pump from being over whelmed. Worst case is you would run out of vacuum coming down a grade or stop and go traffic. For you probably not a problem. For your wife - mmmmm? Only need to tap one side.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[scubaseas]

Turbo Volvo electric pump circa 2007 should be big enough. You will also need a pressure switch to activate the pump. And a relay. And a fuse, A reservoir might be an idea as well if not tapping into the manifold/s.

I have had duals for years and tapped the manifold. Never had a problem with the booster loosing power.
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Al

08/1970 T2a Westphalia owned since 1980

ASE Master certification. 50 years pushing a wrench
Retired

[TomWesty]

I have a ‘71 with dual Kaddies. I run the booster off a tee in the balance tube. It works great. I urge you to reconsider. Tapping the manifold would be the simpler and therefore least likely to fail option. Either way, best of luck to you!
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If you haven't bled on them, you haven't worked on them.
Visit: www.tomcoryell.com and check out my music!

[Spike0180]

none... How sensitive do you want your brakes?
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Brutis Patches Izabich: 1970 VW Transporter - 1776cc DP
Current State: Projects never truly end...
Location: Grosse Pointe, Michigan
Other cars: 2003 F150, 2003 Jetta GLI vr6-6sp

Sambastic: adj; the quality of being nit picky, elitist, expecting everyone to do things the way they believe is best with no regard to situation, "sambastic"

[fxshov]

currently running it without. Kinda reminds me of driving all the old trucks Ive driven. So, anything is an improvement..
_________________
GOOD AINT CHEAP AND CHEAP ANIT GOOD

73 Bay Window
05 Tundra
12 Scion
93 HD Softtail
18 NX 2500
I need a bigger garage.

[Wildthings]

Many diesel automobiles had electric vacuum pumps for their brakes. Personally I would do as others suggested and just tap the manifolds or tie into the balance tube.

[camit34]

[Danwvw]

That's about how I feel about adding a Vac Pump to my 71 Bus! I drilled holes in both the #1 and the #3 but realized they may not like sharing Thought about Check valving them both before connecting together. Wound up plugging #1.
It actually works really well on just #3.
Cheap end castings may be a problem, drilling mine I found they were very thin and the aluminum internal structure is crystallized pretty course, not real strong. They did thread ok but I used J-B Weld to seal the threads. It was a good decision.

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[Wildthings]

[SGKent]

tying the two sides together is commonly called a balance tube. Helps smooth out things. One can put a tee in it for the booster too if one has a balance tube.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin