For some reason this looks flat, but it certainly was not, and anyone within a mile of me would have know that with the horrible noise coming from my disc. I replaced the mineral oil in the rear brake which was frustrating. the kit came with a cup that was supposed to screw into the bleed hole at the brake lever. It was far too small and wouldn’t thread. The instructions said to hook up the syringe at the caliper and push fluid through until nee fluid came out the top. I did that, careful not to get any air into the system. The brakes don’t feel any different but now it makes me thing that the fluid is fine and my disc is the issue. There are black rings on the discs which i never noticed before.  I was thinking of taking the disc of and hitting it with the orbital sander, but i’d probably be better off just getting new pads and rotor.