It is on because there is a problem with the Anti-Lock Brake System. Your normal non-abs brakes will work fine and you cannot tell anything is wrong until you need the ABS to work and it may or may not. There can be many things causing this. It may be as simple as dirt has collected on one of the sensors. Removing the sensor and cleaning may solve the problem. You can then remove the battery cable and reset the light. That may or may not work, You may need to reset the light with a scan tool. Inspect the wiring harness to each sensor and make sure it is securely connected. Turn the wheel to full lock left and right and make sure the wire is not being pulled tight thus stressing the connection. Another problem can be a broken tooth on the reduction ring that will set a code. You really need to have this scanned with a brake scan tool to get an idea of which wheel has the problem if you find nothing from a visual inspection.
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