I have a 2001 Chevy Silverado 2500 4x4. My ABS is kicking on everytime I stop. When traveling fast I can stop on a dime, but when going slow, turning into a parking spot it wants to kick in and not stop at all. Is it the ABS sensor or wheel bearing sensor? or are they the same thing? I talked to a guy who said to replace it you have to buy the whole wheel hub. I called the dealer and they said I can just buy the sensor seperate?? If anyone has been through this I would much appreciate any assistance or input. Thank you all for your time.