Over time your rotor will loose its magentism and essentially "wear". This will result in poor brakes and a new rotor is normally sufficient. But bare in mind once the motor has done that much work the sensor board and bearings have done a fair amount of work, so your usually better off replacing the whole thing.
I know the old novak velocity motors used to loose brakes a lot over time due to the rotor loosing its magentism, espcially on the cheaper bonded rotor versions.
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