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It would most likely be the wear tabs on your brake pads.Replace your pads

that makes sense,then i thought,a leak in the vacuum booster-just in front of driver side -in engine compartment-a rod comes into the vehicle and connects to brake. these can make a sound of rushing air-maybe whistle..so,there is a 2nd possible.

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Q: What would cause a whistling sound when braking?
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