idle goes up when i hit he brakes

kilog55 · Post by **kilog55** » Wed Sep 10, 2008 8:26 am

ok when i depress my brake pedal my idle raises a bit. i know my booster isnt working and i need to replace it. but anyone know what would cause this?

seattle67 · Post by **seattle67** » Wed Sep 10, 2008 8:40 am

I would think that the only thing it could be is the bad booster causing a vacuum leak when you hit the brakes.

ford4x4fun · Post by **ford4x4fun** » Wed Sep 10, 2008 8:50 am

heep70 · Post by **heep70** » Wed Sep 10, 2008 11:32 am

Plug the outlet on the manifold to the booster and see if it still does it.

390F100 · Post by **390F100** » Wed Sep 10, 2008 8:11 pm

It's a booster problem

robroy · Post by **robroy** » Sat Sep 13, 2008 11:38 am

Hi folks,

If pressing the brake pedal caused a vacuum leak, wouldn't the idle speed decrease? I was under the impression that reduced vacuum caused the idle to go down, not up.

I've heard folks describing this particular situation in lots of different cars, so I guess it's pretty common.

Thanks!
-Robroy

seattle67 · Post by **seattle67** » Sat Sep 13, 2008 5:12 pm

Point taken Robroy. I guess what I should have said was, whether the vacuum leak is increasing or decreasing when the brake pedal is pushed, it had to have something to do with the bad booster.

robroy · Post by **robroy** » Sat Sep 13, 2008 5:32 pm

Hey Dan! I see what you mean. Thanks for the advice--I'll remember it.

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idle goes up when i hit he brakes

idle goes up when i hit he brakes

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re: idle goes up when i hit he brakes

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