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The power brakes on most vehicles operate on the engine vacuum. If there is a leak or problems with the power brakes it can make a hissing sound. But then, sometimes power brakes do that when they're working properly. It could be from either a hole in the diaphragm of the brake booster or normal operation. If the sound is new, and was not there before, and your brake pedal is going to the floor, then you should have the power booster replaced.

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โˆ™ 2009-01-20 06:29:59
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Q: Why does it sound like air is seeping out when I press my brake pedal on my 1997 Chevy Tahoe.?
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