new pads? old pads? what are the pad pins like? I have seen pins so worn from brake pad chatter that they hold the pad back from the disc or, worse, hold a new pad onto the disc causing drag/overheat/disc wear. I've never needed to replace the pins, but have had to fettle them.
also, I once got "Gunk" on the discs and it was a marvellous lubricant until it burnt off with braking from high speed
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