Last weekend my ALB warning light came on driving down the interstate. The brakes are working fine. I haven't had a chance to check to see if anti lock is functioning - too many tools in the truck - plan to do so tomorrow. I came up with something about the rear axle speed sensor on a search. Anybody else have their warning light come on? Thanks.

 

Not on my F350, but I have on my Explorer. In it's case it was a rear wheel sensor that had gone bad. Once the light comes on the ABS quits working, although the brakes will work fine. Once the sensor was replaced the ABS started working correctly again.