help, possible brake problem???

for a '99 dodge intrepid...
For the last few days, I've heard a rattling toward my right front wheel. It sounds like I'm dragging a can or a piece of plastic. I checked and rechecked, and nothing is dragging. I felt around the inside of the wheel (I haven't had a chance to take it off yet) and felt nothing. I only hear the noise when I'm going under 20 mph. Anyone have any ideas? My dad thinks that maybe the brake pad broke, and a piece is hanging off, and rattling on the rotor. Does this make sense? Thanks.

I'd say most likely the pad is completely gone (worn out) and the
piston might be stuck against the rotor. This happened to my own '99
Intrepid just a few months ago, there was a constant scraping sound at
low speed. I can't remember exactly what I paid at my local Midas to
have it fixed, but I don't think it was more than a couple hundred.