Guys, I need help determining an issue with a rear disk brake.
Pulled the wheel because I was hearing whisssh , whissh sound there, twice per rotation. I suspected a brake pad dragging twice per rotation (rotor warped?).
But when I looked at the rotor, I saw that the outboard pad was only touching the rotor in two places.
And the inboard side of the rotor has strange marrings on the surface that almost look like it’s been welded and ground. These marrings on the surface are higher friction when I run my finger over them, so they could possibly be the source of the noise.
Oh. And strangely, the noise doesn’t go away when braking.
Any help diagnosing would be appreciated. I’ve attached pictures, although I don’t know how useful they’ll be.
Welded looking area is a tiny bit clockwise form 12 oclock.