Question about 1998 Chevrolet C2500

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How do u know power booster is bad

When i push brak sounds like air coming out

Posted by ronnie shafer on


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That is normal to a degree. When a booster fails, the pedal is very hard to push and the engine can have a vac leak.

Posted on Sep 24, 2012


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Intermitant brake pedal travel issues 98 sable. sometimes braks feel normal and firm then the next time pushing the pedal it seems like the petal travels further than the last time. Has new NAPA master...

Have your vacuum booster checked for leaking, sometimes the one way valve that holds vacuum in the booster fails, It is in the hose going to the booster from motor.

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Air pressure sound when i push on the brakes

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Vacuum from the engine is supplied to the booster, and vented if the brakes are not being applied.

When you step on the pedal, the movement of the pedal blocks the vents, allowing the vacuum to build up. That vacuum then pulls on a diaphragm, assisting you in applying the brakes.

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My brakes are hard to push down and it sounds like air is coming out of the brake pedal

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When replacing, make sure the brake pedal rod goes down the center of the new booster, and that there is sufficient clearance or freeplay in the pedal rod when done. (like .1" is all you need)
Should not have to bleed after done.

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