* Low Brake Fluid: This is the most common reason. Check the brake fluid reservoir (usually a clear plastic container near the master cylinder under the hood). If the fluid is low, you have a leak somewhere in the system – a serious problem requiring immediate professional repair. Do not drive the vehicle until this is fixed.
* Brake Light Failure: One or more of your brake lights might be burned out. While this isn't as serious as a fluid leak, it's a safety hazard because other drivers won't be able to see you braking. Check all your brake lights (taillights, high-mounted brake light).
* Parking Brake Engaged: Though less likely to trigger the red brake light alone, sometimes a partially engaged parking brake can cause it to illuminate. Make sure your parking brake is fully released.
* Brake System Malfunction: This is a broad category encompassing issues like a failing master cylinder, problems with the anti-lock braking system (ABS), or a leak in a brake line. This requires professional diagnosis and repair.
What to do:
1. Do not drive the vehicle until you've investigated the cause. Driving with a low brake fluid level is extremely dangerous.
2. Check the brake fluid level. If it's low, find the leak and have it repaired immediately by a mechanic.
3. Check all your brake lights. Replace any burned-out bulbs.
4. Make sure the parking brake is fully released.
5. If the light remains on after checking these things, have the vehicle towed to a mechanic for professional diagnosis and repair.
The red brake light is a critical warning sign. Ignoring it can lead to accidents. Safety should always be your top priority.
