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Have you cleaned the brakes on driver front yet? Probably just some grit or a small stone.
The only time I've ever heard the air coming out of my tires was during a catastrophic puncture. I picked up a 6" bolt over 3/4" wide with the front tire and it was thrown back to the rear, from the damage the bolt went in almost sideways. It took a hex nut into the tire with it, the sound it made was amazing. Also assuming you've checked tire pressures. Too easy to rule that out.
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