Welcome, and I would check the wire running to the knuckles, sometimes they can get frayed or cut. If not that I would hook a OBDll reader to it and see if it tells you if a switch is broke or something.
is a problem with the ABS, (Anti-Lock Brakes). You still have normal braking but your ABS may or may not work properly. Take it to a professional for diagnosis and repair.
Each wheel has a sensor mounted near the brake discs in the front and drums in the rear. You can see them without even removing the wheels. Look on the inside of the wheels kind of near the ball joint and you will see a small electrical cable. This cable goes to the sensor.
had same problem with mine,but my speedo was also jumping around.took it to dealer and it was my wheel speed sensor on drivers side
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