Another ABS question
 

Ok ive been reading on here and there have been alot of talk about ABS but i havent found my senerio so I just thought I would say mine and see if anyone could help me.
Alright i was on my way to a rodeo with our 06 2500 pullin a trailer with two horses in it when i pulled off the highway to exit the Brake light came on..It wasnt dragging or making any noise so i just kept on going.. When i got to the arena (it was on a gravel road) i hit the brakes and the wheels locked up and i slid.. The ABS has never worked since and the lights still on any suggestions?