Or, it's that's because you're pedalling, there's less relative torque being applied to the rotor.
Easy solution, don't brake.
If I don't brake I'll definitely not hear anything again, for a long time.
I'm assuming it's something like that - the pedaling slips the rotor through quicker so the magic howling resonant frequency isn't attained. (aka witchcraft)
@TooTallTim started
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Or, it's that's because you're pedalling, there's less relative torque being applied to the rotor.
Easy solution, don't brake.