* Low Brake Fluid: This is the most likely culprit. Low brake fluid can trigger both lights. Check your brake fluid reservoir (usually a clear plastic container with markings) immediately. If it's low, you have a leak somewhere in the braking system and need to get it checked by a mechanic ASAP. Driving with low brake fluid is extremely dangerous.
* ABS Module/Sensor Issues: A malfunctioning ABS module or one of the wheel speed sensors can trigger both lights. These sensors monitor wheel speed to regulate the ABS system. A faulty sensor or module prevents the system from functioning correctly, resulting in the warning lights.
* Brake System Leak: A leak in any part of the braking system (lines, calipers, master cylinder) will lead to low brake fluid and trigger the lights. This is a serious safety concern.
* Parking Brake Switch: While less likely to illuminate both lights simultaneously, a faulty parking brake switch can sometimes cause this issue.
* Wiring Problems: Damaged or corroded wiring related to the braking system can also cause the lights to come on.
* Faulty Brake Pedal Position Sensor: This sensor relays information to the ABS module. A malfunction can cause issues.
What to Do:
1. Check Brake Fluid: This is the most important first step. If low, do not drive the truck until you've had it checked by a mechanic.
2. Have it Diagnosed: Take your Silverado to a qualified mechanic or an auto parts store that offers free diagnostic scanning. They can use a scan tool to read the diagnostic trouble codes (DTCs) stored in your vehicle's computer. These codes will pinpoint the specific problem.
3. Avoid Driving (if brake fluid is low): Driving with low brake fluid is incredibly dangerous.
Ignoring these warning lights is extremely risky. The ABS system is crucial for safe braking, especially in emergency situations. Get your vehicle checked immediately to prevent a potential accident.
