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Engine RPM's Increase When Brake is Applied

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Old Jul 17, 2009 | 03:45 PM
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Default Engine RPM's Increase When Brake is Applied
Any idea what would cause my rpm's to increase when I apply the brake in neutral while idleing? I thought maybe my brake booster was shot but my brakes are actually working great..
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Old Jul 17, 2009 | 04:16 PM
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Its a temporary vacuum leak while the booster is refilling.
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Old Jul 17, 2009 | 05:25 PM
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Originally Posted by DWncchs
Its a temporary vacuum leak while the booster is refilling.
So thats normal because it will continually do that if I keep pressing on the brake. The increase is about 200rpm.
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Old Jul 17, 2009 | 05:29 PM
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Mine does the same thing, but also in gear.
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Old Jul 17, 2009 | 06:05 PM
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I would suspect a bad booster causing a massive air leak.

Gary
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Old Jul 17, 2009 | 06:05 PM
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FWIW: I have power brakes in my two. Neither surges as described.

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Old Jul 17, 2009 | 06:17 PM
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I agree that it is not a normal condition and a vacuum leak is
appropriate diagnosis.

Time to check the hoses and fittings.
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