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Choosing vacuum pump CFM

1053 Views 9 Replies 4 Participants Last post by  reiderM, 
M
Hello everyone, the ICE vehicle already had power brakes, after removing the engine "vacuum source" the vehicle already had a brake booster as well as a vacuum canister/reservoir. I will add a vacuum pump, but I'm confused with the sizing terminology and process. How do I choose a specific CFM & pressure setting on the vacuum pump pressure switch. Thanks,
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The easiest way is to use a salvage, or aftermarket new, OEM brake booster vacuum pump - no science needed there. Some also have pressure switches.
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If you use an OEM brake vacuum pump, no math involved and you have an automotive qualified component. There are many to choose from. The GM ones are pretty inexpensive.
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Don't forget the relay for that Chinesium vacuum switch.

@reiderM What pump are you using?
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Not exactly weatherproof, either 😬

I would not use that backwards aquarium pump for brakes in a car, but one actually made for life under the hood of a car. One from salvage shouldn't be that different in cost...

Like all things in life, the noise you get depends on how you're mounting it.
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