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Old 05-23-2018, 06:11 AM
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Vacuum pump switch for brake booster

does anyone have a bullet proof vacuum pump control switch that will allow the pump to cut in and out automatically. I have tried 5 different types with no success. I also have a cannister mounted to assist the vacuum hg. prior to the booster

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Old 05-23-2018, 07:40 AM
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What is happening, never cuts off or never come on? Where is it plumbed in the system?

Without knowing if it's a home built unit. I think a T off the line out from the pump would be the switch mount.

I have a buzz bomb, electric vac pump for brakes. The unit was purchased from MPB. Few years back the switch went south, was able to purchase it from the them

Here is another resource,:

https://sensing.honeywell.com/77342XX-vacuum-switches

I've not use them but looking @ revamping my current elect vac assist. Using a vain type pump, GM part.

One thing i can tell you the extra canaster really has no advantage. I tried that before and only noticed a longer recovery time. The brake applications did not increase.

Having two storage containers, canister and booster increases the volume, yes.

In essence, booster size: example 2cubic feet
Will have a quicker recover time, shorter cycles max system state

When compared to a system with the addition of a canister:


Added canaster, example 2cubic feet

The math 2 + 2 = 4, therefore the recovery time for max vacuum pulled takes twice the time


pep
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Old 05-23-2018, 07:49 AM
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vacuum cut off switch

Try summit or comp cams,both sell parts .
Good Luck!!
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Old 06-17-2018, 05:42 PM
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Red face brake booster vacuum pump control

I am using a hella pump installed prior to the cannister that feeds the booster. Everything is in place and I have a Honeywell nc switch that cuts out the pump at 15 hg. I need at least 18 hg. and have tried even more places for help including talking to MBP (Pat). He wanted to sell me a pump with the differential build in. I don't need a pump and no other suggestions were offered. I cannot believe that this is an unusual problem as there are thousands of radical cams out there that don't produce enough vacuum to power the booster. Can someone please give me a recommendation as I am on the verge of 1 case of brew a day rather than 1/2 case.
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Old 06-17-2018, 09:11 PM
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Look closer at the Honeywell site, the switches are adjustable...

Spec listed for the Honeywell switch ......

"Contact Setting Range 1.1 in-Hg to 22 in-Hg"


pep
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Old 06-18-2018, 08:17 AM
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I never used a pump with my canister. If you have a good inline check valve right off the manifold, the can will hold vacuum for a couple days.

Intake manifold -> check valve -> tee fitting -> one leg of tee to booster -> other leg of tee to canister.

Russ
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Old 06-18-2018, 03:40 PM
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This is how I solved the "low vacuum" issue with my 12.5" hG engine... works perfectly. Canister is required for three reasons. One is that if you have to pump your brakes the vacuum pump may not be able to keep up with vacuum requirement. Two is that the canister (stock item on some GM automobiles) furnishes the extra vacuum in case you pump your brakes (like on ice). Three is that, without a canister, every time the switch closes and the pump is energized, it will go through a number of short cycles before it settles down, adding "wear out" time to both the switch and pump. Sooo.. canister is important.

Full instructions follow:
https://49fordcoupe.smugmug.com/Addi...-Power-Brakes/
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Old 06-19-2018, 08:59 AM
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One scenario where you will need a pump would be an automatic converted to full manual with bands removed so there is no engine braking on decel. Decel is where you normally see 25+ inches of vacuum for the can to "store" until it's needed.

Russ
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