My 2006 Hyundai Accent is revving when I put my foot on the brake
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Asked by James
What's the issue with my 2006 Hyundai Accent? When I put my foot on the brake at a red light, the engine starts to rev up hard.
Answered by CarsGuide
14 Jan 2025It’s very possible that this is a problem with the brake’s booster system. To give the braking system extra oomph, it uses a vacuum operated booster unit that multiplies the force in your leg. The vacuum comes from the engine’s intake system. If this booster develops a vacuum leak, it can allow excess air into the engine’s intake manifold. This extra air messes up the air-fuel mixture and the engine can start to rev up.
The brake booster is the first place a mechanic will check when presented with this problem.
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