* Low Brake Fluid: This is the most frequent cause. Low brake fluid indicates a leak somewhere in the system (brake lines, calipers, wheel cylinders, master cylinder). This is a serious safety concern and requires immediate attention. Check your brake fluid level in the reservoir – it's usually a clear plastic container near the master cylinder under the hood. Do not drive the vehicle until this is addressed.
* Brake System Malfunction: A problem with one or more of the following could trigger both lights:
* Master Cylinder: A failing master cylinder can't properly build pressure, leading to weak brakes and activating the warning lights.
* Wheel Cylinder/Caliper: Leaking or seized wheel cylinders (rear brakes) or calipers (front brakes) will affect brake pressure and trigger the lights.
* Brake Lines/Hoses: Leaks or damaged brake lines can also result in low pressure and warning lights.
* Parking Brake: Sometimes, a partially engaged parking brake can cause this issue. Try releasing it fully.
* ABS Sensor Issues: While a failing ABS sensor might only light the ABS light, it can sometimes indirectly affect the brake system enough to illuminate the brake light as well. A faulty sensor provides incorrect information to the ABS module. This often involves a speed sensor on one or more wheels. The ABS module may interpret this incorrect data as a potential brake problem.
* ABS Module Failure: The ABS module itself can malfunction, causing both lights to illuminate. This is a more complex issue, usually requiring professional diagnosis and repair.
* Wiring Problems: Damaged or corroded wiring in the braking system or ABS system can also be responsible.
What to do:
1. Check the brake fluid level immediately. If it's low, do not drive the vehicle. Have it towed to a mechanic.
2. Inspect brake lines and hoses for leaks. Look for any signs of fluid leakage.
3. Check the parking brake. Make sure it is fully released.
4. Have the vehicle diagnosed by a qualified mechanic. This is crucial to pinpoint the exact problem and ensure safe repair. They have the tools to read diagnostic trouble codes (DTCs) that will help determine the root cause.
Ignoring these warning lights is extremely dangerous. Driving with brake problems can lead to accidents. Get the vehicle inspected and repaired as soon as possible.
