After my last track day I have noticed sometimes when I put the car in reverse and start to back up it sounds like my driver rear brake is dragging. I haven't seen any issues with my actual caliper, or any oddities on my rotor. There are no issues braking at low speeds or high speeds. All the suspension components look fine, and I can't see anywhere the wheel is dragging on anything. Could this noise be coming from the diff and/or axles? I know this is kind of an odd question, I'm just not sure where to go from here. I have the stock brake setup in the rear with Carbotech XP10s, and I don't hear/feel any dragging other than reverse occasionally. Thanks