1. Check the Brake Pedal:
* Push the brake pedal: Is there significant resistance? If the pedal feels spongy or goes almost to the floor, you likely have a brake system problem (low brake fluid, leaking master cylinder, etc.) that needs immediate attention from a mechanic. Do not drive the vehicle if the brake pedal feels spongy or soft.
2. Check the Bulbs:
* Turn on the ignition (but don't start the engine). Have someone press the brake pedal while you check the brake lights on the rear of the vehicle.
* Inspect the bulbs: Are they burnt out? Replace any burned-out bulbs. This is the most common cause.
3. Check the Brake Light Switch:
* Location: The brake light switch is usually located on the brake pedal assembly itself. It's a small switch that activates when the pedal is pressed.
* Visual Inspection: Look for any obvious damage or loose connections.
* Testing (Advanced): You can test the switch with a multimeter (if you're comfortable with this) to see if it's sending a signal when the brake pedal is pressed. Many online tutorials show how to do this.
4. Check the Fuse:
* Consult your owner's manual: Locate the fuse box diagram and find the fuse for the brake lights. Check if it's blown. Replace it with a fuse of the same amperage if necessary.
5. Wiring Issues:
* Check for chafing or damaged wiring: Inspect the wiring harness running from the brake light switch to the tail lights. Look for any broken wires, corrosion, or areas where the wiring might be rubbing against metal parts.
6. Brake Light Circuit Issues (Advanced):
* If none of the above solves the problem, you may have a more complex electrical issue within the brake light circuit. This might involve a short circuit, a faulty wiring harness, or a problem with the body control module (BCM). This requires more advanced diagnostic tools and is best left to a qualified mechanic.
Important Considerations:
* Safety First: If your brake pedal feels spongy or the brakes are otherwise not working correctly, do not drive the vehicle. Have it towed to a mechanic immediately.
* Professional Help: If you're not comfortable troubleshooting electrical issues, take your Explorer to a qualified mechanic. They have the tools and expertise to diagnose and repair the problem safely and efficiently.
This systematic approach should help you identify the cause of your brake lights staying on. Remember to prioritize safety and seek professional help when needed.
