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Choosing vacuum pump CFM

1054 Views 9 Replies 4 Participants Last post by  reiderM, 
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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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remy_martian said:
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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First of all, thank you for replying. The vehicle already has a brake booster as well as a vacuum reservoir, so I just need to add a vacuum pump & pressue switch, right? no need to get another brake booster, the thing is how to know what size vacuum pump I need regarding how much vacuum does it pump, which is CFM as I understand. Thank you,
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