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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Stephen

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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


air pressure sound may come from a leaky vacuum hose or bad check valve at the booster or master cylinder.

But, I think that it's normal to hear a soft hissing sound when depressing the brake pedal which comes from hydraulic fluid going through the passage ways.

Is the pedal hard?

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Its a constent hissing from my brakes in my Mazda 2001 tribute. The noise does stop When i press on the brakes but as soon as i let off them the hissing continues. Ive read it could be the brake booster. ...


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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.

Most people can’t hear that venting, some can.

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The booster is bolted to the firewall, and then the brake master cylinder is bolted to the forward side of the booster.

To replace it you disconnect the brake pedal, remove the master cylinder, take the vacuum line off the booster, unbolt it from the firewall.

Install the new booster by reversing these steps.

But I don't think you need one, from what you say.

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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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sounds like the brake booster is going bad, its loseing vaccum,booster needs replacing,when leak gets big enough brake pedal will be real hard to push, hope this helps,

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