I have a1995 honda civic dx. It creates a few seconds noise like a low whistle at speeds between 30…

I have a1995 honda civic dx. It creates a few seconds noise like a low whistle at speeds between 30 and 40 mph or at slowing down at about 30mph. I went to a mechanic and couldn't figure out, brakes checked okay. This happens about 2 or 3 times at said speed from cold engine start.

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