A whistling noise is coming from the area of my right rear wheel when the car (Elantra 2015) is in motion. But only in forward gear. When the car is in reverse - no noise. It started suddenly today. It only sounds when the car is in motion and it seems to be associated with the speed of the wheel rotation. But again, only in forward gear. Sometimes, sound will go away for a bit - it went away once when I hit a small bump in the road, and another time for no apparent reason - and then will come back when I hit the brakes. So it has something to do with the brakes too, but it doesn’t go away when I let go of the brakes.
(Edited) It’s connected to the brakes in another way as well. The sound stops eventually, when I go about 1/4 mile without touching the brakes. Then when I touch the brakes - while I’m pressing them - it becomes a constant noise, which then becomes a non-constant noise (with noise volume going up and down, up and down very quickly as the wheels turn) when I let go of the brakes until it stops after about 1/4 mile.
Similar posts to this one suggest it may be a faulty wheel bearing or debris on the brake pads. But then it would make the noise when in reverse as well, wouldn’t it?