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Suspect that it's because you're applying a more even load across the hub, so there's not as much twisting force being applied to only one side. I'm not an engineer though, so it could of course just be witchcraft.
TooTallTim-
I'd always assumed it was the rotor making the noise and I doubt the hub is twisting or, if it is, that it's twisting enough to contribute to a squeal. I cleaned the rotor and it shut up briefly but I've now taken to pedaling slowly around corners to make it shut up which is doing my head in (and makes some corners interesting!). I'll try again with kitchen scourer but I just kinda want to understand why there's a magic difference in sound even though in both cases the rotor is still moving over the pads.
I also wonder, if I stuck a 140mm rotor on the back, would it make any difference to the noise, given the same contamination amount...
Summoning @gbj_tester for some engineering input...
hippy
Why does my rear brake squeal when slowing down but immediately stops making noise when I pedal? I assume it squeals because it's dirty and vibrates but the pedaling while braking making it quiet doesn't make much sense - the disc is still rotating, why does it suddenly stop the noise? Is it actually the cassette contributing to the vibration or some weird shit or what?
Confuzzled.