Rattling in front

See if the noise stops while you hold light pressure on the brake pedal. If it does, a brake pad is loose. That's not serious. For elusive noises, there is a tool called the "Chassis Ear" that can be helpful. It's a set of six microphones, a switch box, and head phones. By moving the microphones around and listening while driving, you can narrow down the source of the noise. Be aware that many mechanics have never seen or even heard of this tool, but most new car dealers have them.