Why does a 2008 Chevy aveo RPM raise When you push on the brake and the car stop?

Anonymous

∙ 16y ago

Updated: 8/17/2019

"Power brakes" uses engine vacuum to assist you as you press on the brake pedal. The diaphragm of the power brake module pulls the brake pedal harder as you press harder on the pedal.

Since engine vacuum is being used, some atmospheric air is released into the intake of the engine as you press the pedal. That's all the throttle on your vehicle does to make it go faster. When more air is released into the intake of the engine (that's where the vacuum line is connected for the brakes) the engine will go faster, so when you press on the brake, it's doing the same thing.

Usually people don't notice the slight RPM difference. If the change in engine RPM is extreme you MIGHT want to have the power brake module tested.

Wiki User

∙ 16y ago

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