* Low brake fluid: This is the simplest and often the first thing to check. Low fluid indicates a leak somewhere in the braking system, which is a serious issue that needs immediate attention.
* Faulty ABS sensor: These sensors monitor wheel speed. A faulty sensor will trigger the light. They can become dirty, damaged, or simply fail over time. This is a common cause.
* Faulty ABS control module: This is the "brain" of the ABS system. It can fail, leading to the warning light. This is a more expensive repair.
* Wiring problems: Damaged or corroded wiring within the ABS system can interrupt signals and trigger the light.
* Faulty wheel speed sensor ring: Located on the wheel hub, this ring is what the sensor reads. If it's damaged or corroded, the sensor won't get a proper reading.
* Brake system problems (outside of ABS): While less common, problems within the regular braking system (like a low brake pad or a stuck caliper) *can* sometimes indirectly trigger the ABS light.
What to do:
1. Check your brake fluid level immediately. If it's low, you have a leak and need to get it addressed ASAP. Driving with low brake fluid is extremely dangerous.
2. Have the system professionally diagnosed. A mechanic can use a scan tool to read the ABS system's diagnostic trouble codes (DTCs). This will pinpoint the specific problem much more accurately than guesswork. Trying to troubleshoot this yourself without the proper tools and knowledge is risky.
Ignoring the ABS light is dangerous. While your brakes will still work (though without the ABS function), the ABS is a crucial safety feature that helps prevent wheel lockup during hard braking. Get it checked out by a qualified mechanic as soon as possible.
