Car: 2006 Mitsubishi Lancer ES 2.0L SOHC Automatic
I recently rotated my wheels and noticed that the rear wheels make a slight grinding noise. After some research on the internet, I think the issue could be due to rust in the brake drum. There is no problem with braking and I don't hear any noise when I am driving. I hear it only when I jack the car up and move the wheel by hand.
Do I need to get my drum brakes serviced? Or can I just keep driving like this?
I don't want to do it my self and don't want to take it to a mechanic unless it is really necessary.
Note: The noticed the noise before removing the wheels, and after as well.