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On the Range Rover Mk III this is a common problem. If the noise is coming from the windshield/dash, its actually the wind hitting the bottom of the windshield -- the trim there is loose enough that Rover issued a TSB on the matter. Make sure the plastic exterior trim fits snug...

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Q: What makes my car hum sound at speeds over 45 mph and the sound stops when brakes are applied?
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What makes a car sound like someone cleaning out their saxophone when car is braked and brakes applied?

you need brake pads


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Your truck makes a hissing sound when your brakes are engaged and your brake peddle travels all the way to the floor before stopping the truck also stalls when brakes are engages?

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