2006 Hyundai Accent 48,000 Miles. Makes this weird rumbling noise as I am coming to a stop (when braking) and stops as soon as the car is at a complete stop. It started off being a very rare occurrence when I got the car at 46,000 miles, now it is almost every time I drive. I do not believe it is the brakes (they seem to work fine) for the fact that when Reversing or in Park it will occasionally make the same noise. When I shift to Neutral it calms down quite a bit. It happens much more often when coming to a stop. It drives me insane! I believe you can only hear it from inside the car. Want to take it to a mechanic but not too sure if they will figure it out. Any ideas or thoughts of what it could be? HELP! I know next to nothing about cars and self diagnosing seems impossible.