Low speed braking (under 30 mph) produces a sound like a baseball card flipping around the spokes of a bicycle wheel. Maybe not so loud, though noticeable. Sounds like a subtle bop, bop, bop... sound. Downhill vibration occurs at higher speeds. The car is new to us, so I've only had it on a minor mountain road once. I was on a long higher speed downhill, and braking once in a while to control my speed. It felt like the front rotors were warped, as the steering wheel started shuddering. I tried isolating the brakes from the regen braking by putting it in N. I did this around my neighborhood, but not on any high speed downhills. The brakes felt fine, but I'm not sure that my test was sufficient. I'm leaning towards thinking that the regen brakes were shuddering that time on the mountain road, and not the rotors. Not sure if the two issues are related. Has anyone experienced these problems? What was the outcome?