* ABS Wheel Speed Sensor: While you've replaced the wheel bearings, the ABS sensors themselves could be faulty. Even if the bearings were bad, the sensor could have been damaged during the replacement or previously. A faulty sensor sends incorrect signals to the ABS module, triggering the warning lights. This is the most likely culprit given your recent work.
* ABS Module: The ABS (Anti-lock Braking System) module is the "brain" of the system. It's possible the module itself is failing, malfunctioning, or has internal errors. These modules can be expensive to replace.
* Wiring and Connectors: Check all wiring and connectors related to the ABS system, particularly those leading to the wheel speed sensors. Corrosion, damage, or loose connections can disrupt the signal and trigger the lights.
* Low Brake Fluid: Though you mention no leaks, a very slow leak could be depleting the fluid enough to trigger a warning without making itself obvious. Check the brake fluid reservoir level.
* Faulty Brake Switch: A faulty brake switch (a pressure switch) could also lead to the brake light staying on, even if the brakes function correctly. This is less likely if the brakes *feel* normal.
Troubleshooting Steps:
1. Have the ABS System Scanned: The most effective way to diagnose the issue is to have a mechanic use a scan tool capable of reading ABS codes. This will pinpoint the exact problem. Auto parts stores often offer free code reading services.
2. Inspect the Wheel Speed Sensors: Carefully examine the wheel speed sensors for any signs of damage or debris. Make sure they are properly installed and securely fastened.
3. Check the Wiring: Visually inspect the wiring harnesses leading to each wheel speed sensor for any signs of damage, chafing, or corrosion. Pay attention to the connectors as well.
4. Check Brake Fluid Level: Ensure the brake fluid reservoir is full and that the fluid is clean.
Important Note: Driving with a malfunctioning ABS system is not ideal. While your brakes might still work, the ABS function won't be available, potentially leading to reduced control during emergency braking. Getting the system properly diagnosed and repaired is recommended.
