Hello, I'm new on this board and I was reading some posts, very interesting anf helpful, congratulations.

Ok, My truck is a f150 99, lariat 5.4, 4x4,
about three months ago the ABS light was turning on, I was turning off and on the truck in order to "reset" the system, and the light turned off. But yesterday it turns on, staying "on" all my way home.

When I start the truck during the morning, the light is off, them after few brakes (I feel the ABS activating-the pedal starts to vibrate) the ABS disables again. So there should be something wrong with the system.

I read something about a sensor over the differential and also about some diagnostics. Can someone tell me more about how to troubleshoot the problem?

thanks,

benjie