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Power brake boosters work off vaccum. If there is a slight leak in one of the vaccum lines engine speed would have to be increased to make up the difference.Hence the reason they seem to work fine above idle.
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∙ 16y ago
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How do abs affect engine iddle?
ABS brakes should have no effect on engine idle, but a bad power brake vacuum booster would have an effect on engine idle.
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Your car may fluctuate in idle while applying the brakes due to a problem in the computer. Everything in cars nowadays is regulated by the ECM(Electronic Control Module). A few simple diagnostics tests done by a certified tech can tell you what exactly the problem is. You may also have a bad power brake vacuum booster, this would effect the engine idle when the brakes are applied.
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