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Hissing sound coming from the brake pedal when i applie brakes hissing goes away what is the noise?

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Sounds like ur brake booster is leaking

Posted on Apr 22, 2013

  • marc Apr 22, 2013

    could it be the servo unit

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Posted on Jan 02, 2017

studio500
  • 36 Answers

SOURCE: brake hissing noise

Sounds like it could well be the brake servo unit.

Posted on Apr 17, 2009

  • 1 Answer

SOURCE: Hissing noise when releasing brake pedal

Sounds like your brake booster but can't be sure until I know what kind of truck or car you have....

Posted on Jun 27, 2009

  • 149 Answers

SOURCE: 2005 Ford Escape Hissing sound

The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.

Posted on Jul 02, 2009

  • 1509 Answers

SOURCE: 2009 Hyundai Sonata-clicking noise at brake pedal,brakes applied

This is not a rich mans car so its normal. Your hearing the solinod that lets you take the car out of park after the brake is depressed so the car can't be put in gear unless the brake is on. If the noise bothers you the soliniod can be found and wrapped in insulation like a rich mans car them you can ride on feeling like a rich man too. ( the Beatles sang that a long time ago) and its still true today.

Posted on Oct 14, 2009

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SOURCE: There is a hissing sound that is coming from the

your brake booster is leaking internally. this is a one piece, non serviceable component, and the entire assembly must be replaced. good luck!

Posted on Jul 07, 2010

Testimonial: "Thanks, I had a suspicion"

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1 Answer

Hissing brakes


IT is probably a vacuum leak in the brake booster. With the pedal going to the floor There is either no brake fluid or you will have to bleed the system. Replace the booster and bleed the brakes starting at the longest line first

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yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing

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Hello tgiro7: My name is Roger and I will help with your question. The fact the noise goes away when stepping on the brake pedal says the problem most likely is in the brake area. The pads could be worn out even at 20,000 miles.If the noise sounds like it comes from the front remove the wheels and check the front pads. If the pads are bad most likely the rotors are also bad.Same would apply if the noise emits from the rear. When you have the wheels off check to make sure the calipers will slide in and out on the mount pins. Should they be stuck on binding the pads will wear excessively and prematurely fail. The calipers must move freely on the pins. If you drive with your left foot on the brake pedal? The amount of pressure required to apply the brakes and not stop the vehicle is 1 to 2 pounds of pressure. Wont turn on the brake lights but will put pressure on the calipers. This in turn will wear out the brake pads. Another thing to look at would be an out of adjustment brake switch. Reach down and grab hold of the brake pedal. Give a firm tug on the pedal. Should you feel the pedal give and hear a click or two the switch was set to deep and holding the brakes on.
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Sounds like a broken brake line. The broken line has emptied your master cylinder leaving you no fluid and that's why the pedal goes to the floor. Very dangerour to drive in this condition, be careful.

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