2006 Honda Fit rpm goes up with break

2006 HONDA FIT
85,000 MILES • 1.5L • 4 CYL • 2WD • AUTOMATIC
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ASWAZAR
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When i hit the break , the rpm goes up about 500 rpm and get down again inducing vibration.
what is the possible cause?
thank you
Sep 5, 2015 at 10:03 PM
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HMAC300
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maybe a vacuum leak or leaky brake booster have it checked.
Sep 6, 2015 at 7:55 AM