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Possibly whatever down to whatever they're gritting the roads with?
I've been removing pads and thoroughly cleaning with muc-off disc cleaner then using the same to clean the rotors. Gets me another few wet days London commuting without the screaming.
I'm using stock Shimano pads in RS785 calipers. Have read that lightly sanding the pad surface can rejuvenate them if they've developed a hard glazed surface. I'll be trying that next.
iamalex
Holy shit my brakes scream when it rains!
I now have another set of disc brakes to deal with on the Kona A I bought. One is Hope, the other is Shimano. The rear, Hope doesn't work so well, the Shimano as expected works like Shimano.