* ABS Sensor Issues: The most common cause is a faulty ABS wheel speed sensor. These sensors monitor wheel speed, and if one is malfunctioning (damaged, dirty, or loose connector), the ABS module detects a discrepancy and activates the flashing light. Accelerating puts more stress on the system, making the malfunction more apparent.
* ABS Module Problems: The ABS module itself could be failing. This is a more complex issue requiring diagnostic tools to pinpoint the problem.
* Wiring Problems: Damaged or corroded wiring to the ABS sensors or module can also cause intermittent signals and a flashing light, particularly under load (acceleration).
* Low Brake Fluid (Less Likely with Flashing): While a low brake fluid level *usually* causes a *steady* brake light, a very low level *could* trigger erratic ABS behavior and a flashing light. Check your fluid reservoir nonetheless.
* Brake Light Switch (Less Likely with Flashing): A faulty brake light switch can cause various brake light issues, but a flashing light during acceleration points more towards the ABS system.
What to Do:
1. Check Brake Fluid Level: This is the easiest first step. Low fluid indicates a leak somewhere in your braking system which needs immediate attention.
2. Visual Inspection: Look for any obvious damage to wiring near the wheels (especially near the ABS sensors).
3. Professional Diagnosis: A flashing brake light requires professional attention. You'll need a scan tool capable of reading ABS codes to pinpoint the exact problem. An auto parts store might perform a free scan, or you can take it to a mechanic or dealership. They can test the ABS sensors, the module, and the wiring to diagnose the root cause. Ignoring this can lead to ABS failure and reduced braking performance.
Important Note: Driving with a flashing brake light is not recommended, especially if it occurs during acceleration. The ABS is a safety feature, and its malfunction could compromise your braking ability in an emergency. Get it checked promptly.
