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3

No shift of the caliper can explain a wobble of the disk. A wobble of the disk must mean that the disk is out of alignment with its (the wheel's) axle.
– Craig McQueen
Commented Oct 28, 2019 at 2:51
2

The amount of wobble I see is probably not enough to cause a correctly aligned caliper to rub, so if the caliper has moved, it might have been like that before the prang. The only way to know is to (try to) align the caliper. If that cannot be done with rubbing, the disc may need truing (see park tool "How to true a disc rotor - youtube.com/watch?v=O0c2Ez2v0PU)
– mattnz
Commented Oct 28, 2019 at 3:18
I might take measurements or macro photographs of the brake to judge whether the disc is still centered within the caliper but the pads are unequally worn or the pistons unequally shifted. Because it might be the case the disc - although wobbling in 100s of micrometers - is actually centered, isn't it?
– try-catch-finally
Commented Oct 29, 2019 at 5:25
1

@try-catch-finally I think you overestimate the manufacturing precision of bicycles. Caliper brake pads can move based on oil pressure and resistance against the seal. You just need one seal to be stiffer (or dirty) to have some unevenness. Baring no clear frame damage, I would simply re-align the caliper and get the park tool to straighten the rotor then go ride it. Rotors get knocked and become out of true all the time. It is a bicycle not a space craft.
– Rider_X
Commented Oct 29, 2019 at 17:19

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