Engine RPM increase when brake pedal depressed
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Joined: Nov 2000
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From: FL
Engine RPM increase when brake pedal depressed
My power brakes aren't all that powerful. I was curious if I might have a vacuum leak. With the vehicle in park I noticed if I pump the brake pedal a couple of times the RPM will go up. Is this normal? Is this any indication of a vacuum leak or a bad booster?
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Joined: Jul 2001
Posts: 548
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From: Culleoka, Tn
Car: 85 iroc,96 z28,96 Ram 2500,69RR
Engine: 383 with AFR heads.
Transmission: richmond 5 speed
Axle/Gears: 1991 w/1LE.auburn pro series.2.73's
if ya pump em rapidly rpms will increase-to check booster integrity A)pinch vac.line to booster while running and note any rpm change. B)with engine off park car for an hour come back-pull ck.valve out of booster grommet should still have vacuum within sounds like whoosh.
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May 10, 2023 07:19 PM
