My rear brakes squeal really loud. I have read everything I could about how to fix the issue from toe-in, toe-out, and cleaning rims. Cleaning rims seemed to fix the issue a little bit, but the squealing comes back after some time.

Everything is brand new so I know it's not due to old parts. I have kool-stop pads, and I can't believe these nice pads would be the cause of the noise.

The brakes themselves function well, but I would really, really appreciate it if I can make them run quiet because right now I am announcing my arrival at least 5 miles in advance.

Do you think that it could just be that I need to wear my brake pads out a little bit more?