I was having issues with my abs kicking on when under 5mph. No dummy lights or nothing. I changed out one of the abs sensors because I broke one which was pricey but now the abs does not kick in, but the abs motor still runs??? Now the other sensor I did not replace had the plastic pulled from the copper coil that goes in the hub. It stayed in the hub so I cleaned it and just put it back in place. Could this be what is causing the abs motor to kick on and off? Its more annoying than anything.

 

Could I use a abs sensor for a non-7700 f150? I don't see a difference in the two if that is what is causing this problem or is this in the abs motor itself. Never had issues like this before.

 

The ABS sensors are the same for all trucks, 7700 series or not.

 

Are all the tires same brand and size? I'd pull the sensors and then rotate the bearing and inspect the teeth on the tone ring to make sure they are all in good shape. I also had a case where there was rust build up were the sensors mount. If there is increased clearance between the sensor and the tone ring, this will cause a slow speed abs issue. Clean with a wire brush or razor blade around the hole, but careful not to get any debris in it!

 

Did you recently change the rotors. Twice I've had trouble. Once right after the brakes were done and I swapped them out right away. The second time was a year or so after I did the brakes. I cleaned up the rings, but no luck. So I just waited until the pads were dead and used the auto parts store warranty to replace the rotors too.