Hi folks, have a new issue that started a couple days ago on my 83 300D. In a nutshell, I get a rhythmic tapping/light knocking from the right rear wheel, but only when coasting and slowing down, and only between 15-30 MPH. Applying the brakes, or giving the car power instantly makes it go away. Turning left or right has no effect, it does not do it when accelerating, and there are no other noises, vibrations of any sort. Any ideas before I take the wheel off and crawl under the car?

Thanks