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Why do i hear air when i press the brake pedal

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Well, you don't really hear air when you press the brake pedal. You might hear hydraulic fluid going through the valves in the master cylinder, that sounds like air flowing through a vent. But, I assure you, it is not air.

One can press and pump on the pedal when the car is off and hear the 'rush' of fluid which sounds kind of like air rushing out of an inner tube.

It's a common mistake to believe a rush of air is being heard when pushing on the brake pedal.

Posted on Aug 26, 2010

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HI, the hissing sound is due to a leak in the brakes vacuum booster.

Posted on Aug 26, 2010

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Sounds like your brake booster may be bad... or leaking... i would have it looked at.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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SOURCE: brake air leak noise

check under dash for a leaky vaccum switch. if booster was faulty brake pedal would be very hard to depress.

Posted on Dec 27, 2008

co7196
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SOURCE: hard brake pedal hear air leaking when pedal pushed

When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

Posted on May 25, 2009

DOODYDOODYDO
  • 105 Answers

SOURCE: my power brakes failed and i can hear an air leak,

IF YOUR HEARING IT IN THE CAB YOU MAY HAVE A LEAK AT THE BOOSTER WHERE THE PEDAL ENTERS IT GET UNDER THE DASH AND PRESS THE PEDAL BY HAND AND SEE IF YOU CAN HEAR IT COMING FROM WHERE THE PEDAL ROD GOES INTO THE FIRE WALL

Posted on Dec 09, 2009

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The air seeping is a dead giveaway. Your power brakes are now manual brakes, but stiffer. The diaphram in the brake booster has torn and the hissing noise is the engine vacuum escaping (you hear it louder when you depress the pedal right?). Replace the booster and you will be fine. The brake lights probably don't work because you can't push the pedal down far enought to release the switch. Please rate. Thanks.

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