* Brake System Malfunction: This is the most common and serious reason. It could indicate a problem with your brake pads (worn down), brake fluid level (low), brake lines (leak), the master cylinder, ABS system, or other components of the braking system. This requires immediate attention. Do not drive the vehicle until it's checked by a mechanic.
* Parking Brake Engaged: If the parking brake (emergency brake) is partially or fully engaged, the brake light will likely be illuminated. Release the parking brake to resolve this.
* Brake Light Bulb Failure: Less likely to be the sole reason for the light staying on, but a burnt-out brake light bulb can cause the warning light to come on. This is usually accompanied by a missing brake light in the corresponding rear taillight. Check your brake lights (someone needs to look at the rear lights while you press the brake pedal)
* Low Brake Fluid: A low brake fluid level is a serious issue, directly indicating a potential leak in your brake system. Check the brake fluid reservoir (usually a clear plastic container) and consult a mechanic immediately if low.
If the brake light is illuminated, you should not drive the vehicle until it is properly diagnosed and repaired by a qualified mechanic. Driving with a brake system problem is extremely dangerous.
