I don't see how brake wear sensors can affect the ABS. I think there's something wrong in the translation and that your mechanic recommended changing the wheel speed sensors. Changing wheel speed sensors would make a lot of sense. Or maybe the tone wheel (serrated wheel with teeth on the hub) needs to be cleaned, or maybe the pickup coil next to the tone wheel has some debris on it.
Have you tried reading the codes? I don't know if you can read for wheel sensor codes on your model.
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