Ninety nine percent of the time this is a bad sensor or sensors. But to avoid a lot of extra work, you need a scan tool that can read the live data from each sensor and tell you which one(s) have a problem. The problem is that at least one sensor is dropping out earlier than the others, so maybe the right front reads three mph but the left reads zero, that will set off the ABS.
The usual cause is rust between the hub and the sensor. For that you remove the sensor, plug the hole in the hub with some cotton, then remove the rust from the hub, apply a thin coat of paint, then some silicone to the sensor, remove the cotton and install the sensor. Then you brush some plasti-dip type coating around the sensor to seal out moisture/crud.
It sounds like you may have a wheel speed sensor that is out. These videos will help us find the problem.
https://youtu.be/rTtAnsOlZU4
and
https://youtu.be/Pb6nXV-iamI
and
https://youtu.be/ANWVTh2RQoQ
and
https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide
Please run down these guides and report back.
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Sunday, June 18th, 2017 AT 6:54 PM