* Low brake fluid: This is the most frequent culprit. Check the brake fluid reservoir (usually a clear or translucent container) under the hood. If the fluid level is low, you have a leak somewhere in the system and need to get it checked immediately. Driving with low brake fluid is extremely dangerous.
* Brake light switch failure: This switch tells the car when the brake pedal is depressed. A faulty switch can prevent the brake lights from working correctly and trigger the dashboard warning light.
* Faulty brake light circuit: A problem in the wiring between the brake pedal switch and the brake lights themselves, or a short circuit, can cause this.
* ABS (Anti-lock Braking System) issues: On some models, the ABS system might trigger this light as well. This is usually accompanied by other symptoms or additional indicator lights.
* Parking brake engaged: Although less likely to trigger the specific brake light you describe, a fully engaged parking brake can sometimes cause issues.
What to do:
1. Check the brake fluid level immediately. If low, do not drive the car. Have it towed to a mechanic.
2. Inspect the brake lights: Make sure all your brake lights (left, right, center) are working. If one or more are out, it's still a problem that needs attention, even if you have sufficient brake fluid.
3. Check the parking brake: Ensure it is fully released.
4. Get it checked by a mechanic: Don't attempt to diagnose or repair the problem yourself unless you have extensive automotive experience. A faulty braking system is a serious safety concern.
Driving with a brake warning light on is extremely risky. Have the car inspected and repaired as soon as possible.
