Join Date: Jun 2018
Location: Castro Valley, CA
I suggest braking hard, just short of ABS, from 60 twice in a row, rapidly. Gets some heat in there. Scrapes off the rust. Then see if the sound is still there or at least softer. If it is softer but not gone, try again from 80 twice in a row. If it's not changed at all, it's possibly some kind of issue.
Photon FE, 2013 FR-S, 2014 Forester, and maybe going to get a Fiat 500e