I am writing this to confirm if my suspicions are correct.
Vehicle: 2007 Ford Fusion SEL
I noticed my symptoms Tuesday morning on my commute to work. When driving down the road I could hear an oscillating noise coming from outside the car, I can't tell if it is front or rear. As I picked up speed the oscillating noise would pick up its pace. I did not feel any vibrations with the car, not in the wheel or pedals. Today I parked my car and put it in neutral, then jacked it up, and spun all 4 wheels by hand. I noticed that with my rear wheels I could hear the brake pads sliding across the brake rotor as the wheel spun.
I think my calipers are sticking a bit, but am I correct?