Here are the most likely culprits:
* Low brake fluid: This is the most common reason. The brake fluid level sensor detects low fluid and triggers the flashing brake light as a warning. Low fluid indicates a leak somewhere in the system, which needs immediate attention.
* Brake light switch malfunction: This switch is activated when you press the brake pedal. A faulty switch might be sending intermittent signals, causing the flashing light.
* ABS (Anti-lock Braking System) module problem: The ABS module is a complex electronic component. A malfunction in this system can lead to various issues, including a flashing brake light. This often requires professional diagnostics.
* Brake system leak: A leak in any part of your brake lines or components can lead to low brake fluid and a flashing brake light.
* Faulty brake light bulb: While less likely to cause a *flashing* light, a completely burned-out brake light bulb can sometimes cause erratic behavior in the system's signaling.
What to do:
1. Check your brake fluid level immediately. This is the easiest and safest first step. Locate the brake fluid reservoir (usually under the hood) and check the fluid level. If it's low, do not drive the car until you've determined the cause of the leak and have had it repaired.
2. Inspect your brake lights. Make sure all brake lights are working correctly.
3. If the brake fluid level is okay, or if you've addressed low fluid and the light still flashes, you'll likely need professional help. A mechanic can diagnose the problem using diagnostic tools to check for ABS module errors or other electrical issues within the braking system.
Ignoring a flashing brake light is extremely dangerous. A malfunctioning brake system significantly reduces your ability to stop safely, putting yourself and others at risk. Have it checked by a qualified mechanic as soon as possible.
