* ABS Sensor Issues: This is the most common cause. During the brake job, you may have:
* Damaged an ABS sensor: These sensors are located near the wheel hubs and are easily damaged if bumped or knocked. Even a slight scratch can disrupt their function.
* Dislodged or misaligned an ABS sensor: They need to be correctly positioned to read the wheel speed accurately. If they're loose or out of alignment, the ABS system will throw a code.
* Contaminated an ABS sensor: Brake dust, grease, or other debris on the sensor's tip can prevent it from reading the wheel speed correctly.
* ABS Wheel Speed Sensor Ring Damage (Tone Ring): This is a toothed ring on the wheel hub that the sensor reads. If this ring is damaged (bent, broken teeth, etc.), the sensor won't read correctly. This is less common to damage during a brake job but possible.
* Low Brake Fluid: While you've changed your brakes, ensure the brake fluid level is correct. A low level can trigger these warning lights.
* Brake System Air: If the brake system wasn't properly bled after the brake job, air in the lines could cause problems, including activating the ABS light. This is a key area to check.
* ABS Module Failure (Less Likely): While less probable after a simple brake job, a malfunctioning ABS module is a possibility. This is more likely if the problem existed *before* the brake job.
* Wiring Issues: During the brake job, a wire connected to an ABS sensor might have been damaged or disconnected.
Troubleshooting Steps:
1. Check Brake Fluid Level: Top off the brake fluid if needed. Low fluid is an easy fix, but won't solve the underlying issue if there's another problem.
2. Inspect ABS Sensors: Carefully examine each ABS sensor and its wiring for damage, misalignment, or contamination. Clean them with a suitable cleaner if needed.
3. Check the Tone Rings (Wheel Speed Sensor Rings): Inspect the rings on the wheel hubs for damage. This requires removing the wheel.
4. Bleed the Brakes (Properly): Make sure the braking system is properly bled. Improper bleeding is a very common cause of brake light issues *after* a brake job. You may need a helper for this.
5. Check for ABS Codes: Use an OBD-II scanner (available at most auto parts stores) to read any diagnostic trouble codes (DTCs) stored in your vehicle's computer. This will often pinpoint the specific sensor or component causing the problem.
If you're not comfortable performing these checks yourself, take your truck to a qualified mechanic. Attempting to troubleshoot the ABS system incorrectly could lead to further damage. Improper bleeding can compromise your braking system's safety.
