[Closed] Squealing brakes...

I'm sure this has been discussed before, many times.

My brakes squeal hideously for the first few miles of each. Try as might there seems to be no cure. Everything is aligned right, and the pads are not contaminated, rotors well bedded and not bent. Hubs are in good order too. It's a Aluminium HT with regular QR dropouts FWIW.

After a few miles the noise goes away, but will come back on longer descents.

Should I try a different type/brand of pad? They're Magura Julie HP's with Magura pads.