Engine vacuum – that free bit of force that powers our brakes, keeps the headlights down on our Lotus Elans, and provides the myriad of hoses under our hoods – oh what would we do without you? 
Here’s an example of that kind of vacuum in action, and why you should keep the Hoover® away from your genitals. Source: [Imgur.com]
Why Vacuum-Assist Makes Power Brakes Work So Well
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