Sable making noise which stops when braking or turning

Car started making a noise that sounds like air being blown over a soda bottle. It stops when the brake is even lightly touched or when turning. There is a little hole in the exhaust in middle of car, but this noise sounds like it is coming from the front of car.

Have the brake pads on the front checked for wear. This maybe the wear indicator telling you it is time for new pads.