Question about 1998 Jeep Grand Cherokee

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Power brakes went out. Makes hissing noise when brakes are applied. I was reaching for something undermy seat and was pushing hard on the pedal... Thanks, Troy Tearoy38@pacbell.net

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It sounds like the diaphram in your brake booster is leaking.booster assembly needs replacement.

Posted on Sep 25, 2009

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My breaks on my 2001 dodge intrepid are hissing what could this be?


Hi Melissa, I'm glad to help. Intrepids were bad about the brake booster seal allowing a vacuum leak when the brakes are applied, If the brakes are real hard to push and its not stopping properly you'll need a new brake booster. However, if its only hissing but stopping properly and you can live with the noise its not affecting your brakes at this time. Hope this helps and have an awesome day Melissa.

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1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

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I think I would get the body computer scanned for trouble codes and find out why the ABS warning light is on first.
The hissing noise usually means the booster is leaking vac but if the booster was faulty the brake pedal would be hard to push.

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You have a leaking power brake vacuum (this is what you hear) operated power booster. Go to this link to read the procedure of removing and pacing the power brake vacuum booster

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Yes sound like brake booster. most of time when booster is going bad makes hissing sound when brake applied.But should not make any kind of air leakage noise at all.Replace brake booster.Hope this was helpful for you.

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94 s10 chevy 2wd brake pedal fades to floor before stoping


Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes).
...maybe have an assistant push on the peddle while you listen with a piece of hose or a stethescope to find the leak (or I suppose the power unit diaphragm could be shot/leaking--hence replacement), but since you said after bumpy road etc, one could hope for a simple dislodged vacuum hose or fixable crack.

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1 Answer

Brake light on, power brakes seem gone


Chk. for vacume to booster, or loss of vacume like a break in vacume hose, do you hear a hissing noise when you step on break peddel. If you don't hear anything chanses are its the booster. When peddel gets hard to push you either lost vacume or booster went bad.

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This noise is the seal for the power brake booster leaking, you will have to replace the vacuum booster to fix it.

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