brake booster vacuum leak?

[duster97]

Is it normal to have your engine rev down when you pump the brakes, or is that an indicator of a vacuum leak?

[marlinh]

That doesn't sound normal. There shouldn't be any change in engine speed when you brake. Maybe a vacuum leak or a bad booster? What do the brakes feel like?

[duster97]

It's only when I pump the breaks like several times. They car still stops just fine. It doesn't really feel like anything is wrong with the breaks I think.

[Petros]

several pumps of the pedal depletes the reserve vacuum in the booster, so it would likely make a small change in idle speed once you empty the vac booster of vacuum. verify you do not have any other vacuum leaks of course, but it does not sound like anything unusual.