* Brake Fluid Level: This is the most likely cause. Low brake fluid triggers the light. Even if the fluid level seems okay, there might be a leak somewhere in the system. Check the brake fluid reservoir (usually a clear or translucent container) and top it off if needed. However, only topping off the fluid is a temporary fix; you need to find and repair the leak. Driving with low brake fluid is dangerous.
* Brake Switch: The brake light switch is located near the brake pedal. It's a simple mechanical switch that activates when the brake pedal is pressed. A faulty switch can intermittently make or break contact, causing the light to flicker. This is a common failure point on older vehicles.
* Wiring Issues: Worn, corroded, or loose wiring in the brake light circuit can cause intermittent problems. This often manifests as flickering or intermittent lights. Look for any damaged wiring near the brake pedal, under the dash, and around the brake light switch.
* Bad ABS Module (Less Likely): While less probable, a failing Anti-lock Braking System (ABS) module can sometimes trigger the brake light. This is usually accompanied by other ABS warning lights or symptoms.
* Faulty Gauge Cluster (Least Likely): In rare cases, a problem within the instrument cluster itself could be the cause. However, this is less likely than the other possibilities.
Troubleshooting Steps:
1. Check the Brake Fluid Level: This is the absolute first thing to do. A low level is a serious safety concern.
2. Inspect the Brake Light Switch: If the fluid level is fine, visually inspect the brake light switch for damage or corrosion. It might be worth trying to carefully wiggle the switch to see if the light flickers when it moves (but don't force anything).
3. Check the Wiring: Look for any loose, damaged, or corroded wires in the braking system's wiring harness. This is best done with the help of a wiring diagram for your specific vehicle model.
4. Professional Diagnosis: If you're not comfortable checking these things yourself, take your Explorer to a mechanic. They have the tools and expertise to properly diagnose the problem and make the necessary repairs safely.
Ignoring this warning light is risky. A problem with your braking system is a serious safety hazard. Address it promptly.
