I hear a rhytmic metal "rattling" sound which gets faster as I accelerate until the road noise drowns it out. The sound also stops once I barely touch the brakes. You can't hear it from the inside of the car, but if I drive very slowly near a wall or a line of parked cars I can hear it through my open window. I think it's coming from the wheels or an axle somewhere. Perhaps a locked caliper? Any ideas anyone?

 

check out your rotors/pads, i had an extra piece of metal stuck to my rotor that was rubbing on pad. Something rubbing some where, lift it up and check it out.

 

jack up the front and spin the wheels.

 

what would that do?

 

I can't really jack the car up anyway. I live in an apartment with no garage and no tools. What could it be?