* ABS Sensor Malfunction: A faulty ABS wheel speed sensor is a common cause. These sensors monitor wheel speed, and if one is bad, the ABS light illuminates. A malfunctioning sensor can also affect the ABS's ability to modulate brake pressure properly, leading to unusual brake noise (grinding, squealing, etc.) during braking.
* Low Brake Fluid: Critically low brake fluid level is a major concern. This could be due to a leak in the brake lines, calipers, wheel cylinders, or master cylinder. Low fluid compromises braking effectiveness, and can trigger the ABS light due to pressure sensor issues within the ABS hydraulic unit.
* Brake Pad/Shoe Wear: Worn brake pads or shoes can cause squealing or grinding noises. While not directly related to the ABS light, severely worn brakes can affect the ABS system's operation.
* Brake Caliper Issues: A seized or sticking caliper can cause excessive brake drag, leading to uneven brake pad wear, noise, and potentially trigger the ABS light due to wheel speed inconsistencies.
* ABS Module/Pump Failure: Although less common, the ABS module (the computer controlling the system) or the hydraulic pump within the ABS unit could be failing. This would explain both the light and unusual brake behavior.
* Wiring Issues: Problems with the ABS system's wiring harness (corrosion, broken wires) can disrupt sensor signals and cause malfunctions, leading to both symptoms.
What you should NOT do:
* Ignore the problem: Driving with a faulty braking system is extremely dangerous.
What you SHOULD do:
* Get it checked immediately by a qualified mechanic: Do not attempt to diagnose or repair this yourself unless you have significant automotive experience. The safety risk is too high. A mechanic will be able to diagnose the root cause of both the ABS light and the brake noise, and perform the necessary repairs.
* Avoid harsh braking: Drive cautiously and avoid sudden stops until the problem is fixed.
The ABS light and brake noise combination strongly suggests a significant brake system issue that requires professional attention. Don't delay getting it checked.
