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Whistleing brakes on 2002 Volvo V70 XC

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.

Asked by for the 2002 Volvo V70 XC
brake booster could be leaking