right rear metal to metal rattle sound

[Johnmed]

Originally Posted by MikkiJayne

Broken spring. Sounds like the bottom coil has snapped off and the broken ends are touching and making a noise. I had the same thing on my D2 and our TT

I was thinking dust shield around the disc like others until I read this^.

I had the very same maddening noise on my old e46 3 series, and it was the rear coil that had snapped at the bottom. I'd forgotten all about that until I read MikkiJayne's comment. Simple enough fix. I bought some spring compressors from eBay cheaply enough. Fine for occasional use.