vacuum pump

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Mar 9, 2007 | 05:08 PM

bricklayer

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vacuum pump

Hay- how many inches of vacuum should I have at the pump? I am looking at about 25.I have had a problem with my brakes and am woundering if 25 inches is enough.Thanks

Mar 9, 2007 | 05:34 PM

brownieboy525

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From: south jersey

you should have at least 18in of vacum

Mar 9, 2007 | 07:48 PM

PLC7.3

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From: Manitoba

At curb idle (650rpm) there should be 21 inches.........within 30 seconds.

Mar 9, 2007 | 07:49 PM

PLC7.3

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From: Manitoba

At sea level and at curb idle (650rpm) there should be 21 inches.........within 30 seconds. Higher altitudes make a difference.

You mentioned 25 at the pump......... it should be taken either at the vacuum manifold or at the booster.

Last edited by PLC7.3; Mar 9, 2007 at 08:02 PM.

Mar 10, 2007 | 06:35 AM

bricklayer

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I am having a problem with the brake pedal drop after the truck is started.I checked vacuum at pump,manifold,and booster all showing 25in. If I run a hose from the pump to the booster the pedal stays up.This makes no sence,when I have 25in at all locations.