Antilock braking light
A problem with the ABS system. Maybe it is a bad wheel speed sensor. If you can get the ABS codes read you should know what the problem is.
Regrest is right, code reading is the first step in finding the problem, most common are the wheel speed sensors and or connectors.
Try a visual check. The wire for the sensor on explorers is not attached well to the steering knuckle, just a plastic clip for most. If it comes loose it can wear clean through via steering..
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