* Low Brake Fluid: This is the simplest and most common reason. Check your brake fluid reservoir. If it's low, you have a leak somewhere in the system and need to find and fix it *before* driving. Low fluid can cause brake failure.
* ABS Module Failure: The ABS module is a complex computer that controls the anti-lock braking system. It can fail internally, causing the lights to come on. This often requires professional diagnosis and repair, potentially involving a costly replacement.
* Wheel Speed Sensor Issues: These sensors monitor the speed of each wheel to enable the ABS to function. A faulty sensor (or wiring to a sensor) will trigger the lights. This is a relatively common problem and might only require sensor replacement.
* Brake Light Switch Failure: While less common if the ABS light is also on, a faulty brake light switch can trigger both lights. This switch is relatively inexpensive to replace.
* Faulty Brake Pressure Sensor: This sensor monitors brake pressure and is crucial for ABS function. A malfunctioning sensor can activate the warning lights.
* Wiring Issues: Damaged or corroded wiring related to the braking system or ABS module can cause intermittent or constant illumination of the warning lights.
What to do:
1. Check the Brake Fluid: This is the first and most important step. If low, do *not* drive the truck until the leak is found and fixed.
2. Have it Professionally Diagnosed: The best approach is to take your truck to a qualified mechanic or auto repair shop. They have diagnostic tools that can pinpoint the exact problem, saving you time and potentially money from unnecessary repairs. Simply replacing parts randomly is not recommended.
3. Don't Ignore the Lights: Driving with these warning lights illuminated means your braking system may not be functioning optimally, potentially compromising safety. Do not drive the vehicle extensively until the problem is identified and resolved.
The year and model of your truck is important because specific issues are more common in certain years. A qualified mechanic will be best equipped to diagnose the exact cause in your specific case.
