hi i recently get a 2000 explorer with the 4.0l. the abs light has been comeing on randomly some time withing the first 5 times pressing the brakes other times it will take much longer... when the light isnt on, it feels like the abs is kicking in when its not supposed to (as im new to the vehicle i dont know if this is normal) i have read that the rear speed sensors a common problem but would think the light would always be on in this case. any common problem you guys could think of for me to check