* ABS Sensor Issues: During the brake work, a technician may have inadvertently damaged an ABS wheel speed sensor, its wiring, or the connector. These sensors are crucial for the ABS system to function correctly. Even a slight bump or dislodgement can trigger the warning lights.
* Wiring Problem: The brake system and ABS system share some wiring. During the tune-up or brake work, a wire might have been pinched, broken, or improperly reconnected.
* Brake System Fluid Level: While less likely after a brake job, a low brake fluid level can trigger these lights. The dealership might have not topped off the fluid properly.
* Faulty ABS Module: Less common, but possible. The ABS module itself could have a fault, although this is less probable given the timing.
* Electrical Issue from Tune-up: Though less likely, it's possible something was accidentally dislodged or damaged during the tune-up that impacted the brake system's electrical components.
What you should do:
1. Return to the Dealership IMMEDIATELY: This is the most important step. Since the problem arose after their work, they are responsible for diagnosing and fixing it. Explain the situation clearly and emphasize that the problem began *after* their service.
2. Don't Drive It Much: Driving with ABS and brake lights illuminated means your ABS is disabled. While you can still brake, it's less safe and you lose the anti-lock braking assistance. Minimize driving until it's repaired.
3. Document Everything: Keep a record of the date of service, what work was performed, and the date the warning lights appeared.
The dealership should investigate the cause. It is their responsibility to correct the problem they introduced. If they are unhelpful or unresponsive, you may need to escalate the issue to a higher authority within the dealership or even contact your state's attorney general's office or consumer protection agency.
