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The front rotor is warped and causes the front brake to pulse like crazy. Perhaps the warping occurred when it got wet while hot??



I have this same problem. I also had it with my dual-disc BMW R100. Thing is, changing out the rotors didn't help. Neither did replacing the front wheel. It remains a mystery.

-Joe Merlino Boston, MA USA 1982 BMW R100 (decomissioned), 2003 America Triumph: Cool enough for The Fonz, cool enough for me.