When I am braking lightly (i.e. foot barely touching pedal) I sometimes hear a kind of "thunk" noise which seems to come from the rear driver's side. Does anyone have any idea what this is? Do I need to worry about it?

 

rotors? i doubt it tho.

 

One other thing....I've only noticed it at low speeds. Of course, that could be due to the fact that at higher speeds the noise is drowned out. I guess I should take it in to the dealer and have them hear it. Only problem is that it is not a consistant thing.