* Parking Brake Engaged: The most obvious reason. Make absolutely sure your parking brake is fully released. Sometimes it can feel like it's released, but isn't quite all the way.
* Low Brake Fluid: This is a serious issue. The parking brake light often shares a circuit with the brake system's low fluid indicator. Check your brake fluid level in the master cylinder reservoir (usually a clear or translucent container). If it's low, you have a leak somewhere in your brake system and need to get it checked by a mechanic immediately. Driving with low brake fluid is dangerous.
* Brake System Malfunction: A problem with any part of your brake system can trigger the light. This could include:
* Worn brake pads or shoes: Sensors in the brake system detect low pad material.
* Faulty brake wear sensor: The sensor itself might be broken or improperly installed.
* Problem with the brake calipers or wheel cylinders: These components can leak or seize, affecting brake pressure.
* Master cylinder issues: A failing master cylinder can cause low pressure and trigger the light.
* Brake lines or hoses: Leaks in the brake lines or hoses will also result in low fluid pressure and thus, the light.
* Faulty Parking Brake Switch: The switch that detects if the parking brake is engaged can fail and stay "on," even when the brake is released.
* Electrical Problem: A short circuit or faulty wiring in the brake light circuit could cause the light to illuminate inappropriately.
What to do:
1. Check the parking brake FIRST. This is the simplest solution and resolves the majority of cases.
2. Check the brake fluid level. If low, do not drive the vehicle until the leak is found and repaired.
3. If the fluid level is fine, or if the light remains on after checking the fluid level, you'll need a mechanic to diagnose the problem. The problem could be anything from a simple sensor replacement to a more serious brake system repair. Ignoring a persistent parking brake light is unsafe and could lead to brake failure.
Don't delay getting this checked out – your safety depends on a properly functioning braking system.
