ABS Sensor

I have a 95 Town Car with 110,000 miles. When I apply the brakes and am almost stopped I hear a sound made by the ABS but the brakes do not pulsate. If I bring it to a complete stop the sound stops, if I do a rolling stop the sound continues for a couple of seconds. Could this be caused by a bad sensor? Also, where is the sensor located and how do I change it. What does it look like.

Thank you,

bblades337