I had the same sequence of events a few years ago, but without the waving.
I think I may have installed the cable into the bracket, or the bracket on the car the wrong way round for this much tension. Sadly the warning became permanent. I tried to repair the cable, but the breakage must be where it is encased in the same moulded insulation as the ABS cable so I gave up. Tried new earth too.
Both sides are wired in series. One side goes to earth and the other to the instrument cluster.
I took out the cluster and made a small jumper wire from an earth pin to the brake sensor pin.
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