Standard Motor ABS Speed Sensor # ALS2247Standard Motor ABS Speed Sensor # ALS2247 ABS Speed Sensor, Stock, Each Standard Motor ABS Speed Sensors Standard Motor ABS speed sensors supply information regarding wheel movement to the ABS computer. They're often located at each wheel hub rotor on 4 wheel disc systems. Alternatively, on rear drum applications, you'll usually find them mounted on the differential housing. Under braking, if wheel speeds are unequal, indicating wheel lockup, the