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Why does your truck idle goes up and down when you press down on the brakes?
Wiki User
∙ 14y ago
Your brake master cylinder uses a vacuum assisted module to increase the hydraulic force on the brakes while reducing the amount of effort the driver has to put on the pedal.
When you press down on the brakes, it employs this vacuum-powered diaphragm which "borrows" vacuum from the intake manifold. This initially causes a drop in manifold vacuum and thus you see this with a slight drop in idle speed.
It's more pronounced on bigger engines, and prior to computer controls and fuel injection it was actually QUITE pronounced. Smaller engines with fuel injection and computer control do not see this byproduct as much.
Wiki User
∙ 14y ago
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