Hi,
I am trying to picture in my mind what they could have done to cause it, but am at a loss. Since it is speed related, confirm that the backing plate behind the brake rotor isn't hitting. Also, there was no reason to remove the brake caliper, but make sure nothing is loose there.
One last thought, if you are feeling a wobble, I suggest lifting that tire safely off the ground, place your hands at 3 and 9 o'clock and see if there is play. Also, do the same at 6 and 12 o'clock. One last thing, make sure the wheel is tight.
Let me know what you find. If you can record the sound and upload it for me to hear, it might be helpful.
Take care,
Joe
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Monday, June 29th, 2020 AT 9:58 PM