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I recently bought a 2008 C4 Grand Picasso. The car seems to run perfectly well, but there is a strange high-pitched whine that seems to be coming from the rear of the car (sounds like someone blowing across the top of a bottle). Does anyone have any idea what might be causing it? It is not constant (occurs about 60-70% of the time) and it stops when I apply the brakes

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    Is the sound dependent on engine RPM, wheel speed or vehicle speed? If you rev in neutral does the sound occur? – GdD Feb 18 at 15:28

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