1999 Other Jeep Models hissing noise

1999 JEEP
140,000 MILES • 6 CYL • 4WD • AUTOMATIC
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BOSSYMAMA
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  • 1 POST
i have a 99 grand cherokee and there is a hissing noise coming from the brake pedal and when you push on the brake pedal it stops and as soon as you let off it starts hissing again.
Feb 13, 2008 at 1:03 AM
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2CARPRO JACK
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Sounds like a vacuum leak under the dash. Most likely the brake booster, but I would look first to be sure there arent any vacuum lines down there for the cruise control. They would be on the brake pedal assembly, going to a switch if there even are any. If none, then the brake booster is bad
Feb 13, 2008 at 8:16 AM
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