[psschmied]

I've been using Bosch 26010747 coated rotors and know that their rain grooves drag on the OEM dust shields. The dragging rubs off the coating on one side of the groove. I use a dremel to grind away some materiel from that area. If you don't have coated rotors, you could spray a light mist of primer in the groove, clean off the over spray with brake cleaner, mount the caliper and drive around enough to induce the sound.

I prefer the coated rotors because they don't rust in the hidden non-working mounting contact areas. Since I cleaned the hub of all rust and scale, applied antiseize to the hub, and used new retention screws once, 5 years ago, the rotors come off easily with just a JIS-3 screwdriver. That's a work saver. Those *&%#$!! rear brakes need careful inspection and complete cleaning every spring in Chicago.

I had been using Wagner Thermoquiet pads, but because Wagner has abandoned the molded shims (without updating their web specs or box labeling for the pad models we need) , I'm switching over to Bosch pads as the Wagner need replacing.

 

[psschmied]

Came to the same conclusion.
I also would feel more comfortable having the tiny spare on the rear.

Space saver spares are car crutches - only suitable for limping at reduced speed to the nearest tire shop. They have a contact area half that of the OEM tires and are inadequate for driving on anything but dry roads. You aren't supposed to feel comfortable driving on them, just relieved that you can drive away from where the standard tire failed.