wheel noise
 

Sonata 2006 GL 4000 miles: I haven't moved the vehicle for about 2 weeks,
during this season of rains.
Now I have a noise every time one of the wheels rotates. Seems to be coming
from the rear ones. Noise frequency accelerates with the rotational speed. I
thought that it could be a brake pad and that it would go away if I drive
and brake. After half an hour of local road driving the noise is still
there.

Any ideas?
FG