Question about 1999 Jeep Grand Cherokee

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There is an air leak under the dash and it ties in with the brake pedal

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Put you hand up under the dash where the brake peddle arm goes through the firewall,, there should be a rubber boot on it. Then push down on the peddle with your other hand. If you feel air coming out your booster is bad. The diaphragm is shot. You can buy a rebuilt one much cheaper than a new one at a parts store. There will be a core charge until you return your old one. Not a hard job ,,just difficult to get at the 4 bolts on the inside under the dash. Disconnect the master cylinder (2 bolts) and take off the check valve and hose that plugs into the booster. Remove the old,, install the new in reverse. Be careful to hook the peddle up the same ,,there is a switch that works the stop lights and allows you to go out of park when the peddle is depressed. Also be gentle moving the master cylinder over,so you don't break a line open if they are old.

Posted on Apr 05, 2012

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It is a defective brake booster. When the internal diaphram of the brake booster develops cracks or pinholes from age, the crankcase vacume pulls air through the defective break booster diaphram from the air intake valve located on the rod connected to the brake peddle. At first the air leak sound my change or even go away when the brake peddle is depressed. But over time the booster diaphram will detierorieate to the point where the air leak sound will be contiuious. This is a problem that should be addressed ASAP as a defective break booster reduces the power assist to the break peddle and may make it difficult to apply enough break pressure to stop in an emergency situation.
Have the brakes checked by a certfied brake shop right away.

Posted on Feb 04, 2010

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Most likely is an a/c line getting pinned when the brake is pressed.

Posted on Feb 01, 2010

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