I have about 157 miles on my new F56 JCW and I've noticed that when I slow down (brakes or no breaks), there's a low-frequency sound...sort of a vibrational/friction/rotational sound when slowing down. Kind of a "wrow wrow wrow wrow wrow..." sound. Almost sounds like a brake mud shield is vibrating. If I was driving an electric/hybrid car, I would think it was regenerative braking or the electric motors, but this is a gas-powered '22 JCW.

Has anyone else run into this phenomenon? It is a wonky sound and hard to describe - I'll try to get a recording if possible

Any ideas as to what to check?

I might have to go hit up the dealership, but I hate wasting time if they can't figure it out.

 

My thought is that would be a slightly warped rotor. Do you feel any pulsing in the brake pedal?

 

I didn't notice any brake pedal vibrations. I'll get out and drive some more today and see what I can reproduce.

 

I think I’ve noticed some of the same.

 

At least I'm not going crazy. I had less of it today. Maybe whatever it may be is normal, and maybe will go away over time (maybe not). It doesn't seem to cause any issue that I can see (and hope it doesn't cause an issue I can't see!) - but is definitely strange.