Most common cause would be a faulty wheel speed sensor or damaged wires.
There could be a lot of causes to this light being on.......... Have a technician hook it up to an ABS computer.
Something is wrong with the ABS system.
There is a problem with your ABS. Get it seen by a mechanic.
There is a problem with the system. Have this looked at by a professional.
light sensor
ABS stands for Automatic Braking System. The ABS light in a 1997 Ford Explorer will come on when this braking system is activated.
Bring to a shop that has an ABS scanner to determine the problem
most of the time your pads are about gone
You may have an ABS sensor going out at one of the wheels.
Could be a broken ABS sensor ring at one of the wheels
There are several causes for ABS light to come on the 99 Sunfire. This may be due to worn or leaking master cylinder, contamination of brake fluid, or leaking brake hose.
Problem with the Antilock Brake System, (ABS). The repair is best left to a professional.