The light could be on due to a variety of reasons, including:
* Low brake fluid: This is a common cause. Check your brake fluid reservoir.
* Faulty ABS sensor: These sensors monitor wheel speed. A faulty sensor will trigger the light.
* Faulty ABS control module: This is the "brain" of the ABS system.
* Wiring problems: Damaged or corroded wiring can disrupt the system.
* Faulty wheel speed sensor ring: This is a component on the wheel hub.
* Other electrical issues: There could be a problem with the fuse or relay.
It's crucial to have the ABS system diagnosed by a mechanic as soon as possible. Driving with a malfunctioning ABS system increases your risk of losing control of your vehicle during emergency braking.