Having a little issue with a hum coming from the front end. Not sure if it could be tires, bearings or brakes. When I get up to about 30 mph I start to notice a hum coming from the front of the car. Not totally sure which side or if both. When driving if I turn to the right the noise stops but starts again once I straighten out. As I slow done the tone gets deeper and stops right before the car comes to a complete stop. Any thoughts???