Why do the brakes of a car not work sufficiently when the car is off?

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Tried rolling my car back a little into the shade without turning it on and had to press extra hard on the brakes for it stop.

In: Engineering

5 Answers

Anonymous 0 Comments

There is a brake assist drum near the engine. It helps with braking by using the vacuum from the intake manifold of a running engine. If you look on this drum, which is located under the brake fluid reservoir, you’ll see a tube connecting the drum to the intake manifold. If the engine isn’t running, it doesnt’t cause a vacuum, so there is no brake assist.

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