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Whistleing brakes

(2002 Volvo V70 XC)
in Lititz, PA on February 28, 2011
I have a hissing sound and whistle from (a braking) component. Reason, when I step (press) on the brake pedal the noises stop. Any clue as to what this is. It sounds like an air leak.
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Popular Answer
on February 28, 2011
brake booster could be leaking
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