1998 Mercury Mystique Brakes make "creaking" soun

The best way I could describe the noise is a "creaking". It does not sound like a "grind" and not really a "squeek", since it is not high pitched, but more low pitched.

It only happens as I am comming to a stop, at a stop sign or traffic light, and I don't really hear it at the beginning of braking. It is probably the last 10-15mph before stopping completely.

The "creak" is not exactly constant within the last few seconds of stopping, it is slightly pulsed and is usually 4 or 5 "creaks" that are close together.

The brakes feel completley normal, and do not pull to one side or the other, and they don't feel weak or different. I had my brakes changed maybe 9 months ago (along with the master cylinder), so I know the pads/shoes are not bad.

Lastly, from the inside of the car, it sounds like it is the rear, right side wheel.

Thanks for your input!