Question about 1993 Jeep Grand Cherokee

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When you press on the brakes it sounds like there is air coming from under the pedal

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Check this information about Brake System and the next pages.

Good luck.

Posted on Aug 20, 2008

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Check the vacuum booster

Posted on Aug 13, 2008

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1 Answer

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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Replaced rear brake pads, now there is a hissing sound coming from brake pedal when i start it , come to complete stop and after i turn car off .what is the hissing or air pressure release sound coming...


There are 2 things that can use vacuum near the brake pedal. If you have cruise control, there is a safety switch on the pedal to shut off the curise when you apply the brake. This switch may be leaking.
The other part is the brake booster, which is actually in the engine compartment but bolts to the firewall, and your brake pedal mechanism pushes into the booster. You will need to get your head under the dash with the engine running and press on the pedal to locate the leak--on the switch or on the wall.

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REPLACED THE ABS ACTUATOR AND NOW CANT GET A GOOD PEDAL


are you getting air out of the bleed nipples at the wheels ? if you getting a good flow of brake fluid at the wheels then sounds like there air stuck in the abs pump, First try bleeding the brakes again with the engine running and under load with some1 pressing the brake pedal on and off . If you still not have a very good pedal crack the brake pipes off at the abs pump just very slightly just enough for the fluid to flow out and repeat the bleeding process again with some1 pressing the pedal on and off and that should sort the problem out . please feel free to ask any questions thanks

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3 Answers

Why do i hear air when i press the brake pedal


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.

Aug 26, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

Whistling sound while applying brakes.


this could be an air leak in a hose,,,have a friend hold the brakes on and stick your head under the hood,,with the engine running press the brake on,,you may here the whistling and fine were its coming from i its a leaky hose fix it fast before you loos your brakes

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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

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1998 Suburan brake pedal gushes air along the firewall.


you got it, the booster is leaking reducing the vacuum to the intake, replace it

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