it could be your calipers... have they ever been rebuilt,on the negative side they are made of cast iron very old technology 4 piston calipers. dave w should be able to guide you on this one as hes warmed his brakes plenty of times round the ring i wonder if he ever had brake squeal...Hi m5killer yes I'm using tue original disks and pads.
they were good for when they were made and are still ok but when you know you can be braking a hell of a lot better theres only one way to go....Would you say that when the stock Discs/Calipers are in 100% working order are they good? average?
Obviously newer better technology in brakes design and materials have made them a lot better