* Low Brake Fluid: This is the most common and easiest to check. Low brake fluid indicates a leak somewhere in the system – a potentially serious issue. Check your brake fluid reservoir (usually a clear or translucent container near the master cylinder) and top it off if necessary with DOT 3 brake fluid (never mix brake fluid types). If the fluid level is low, *do not drive the truck until the leak is found and repaired*. A low level often trips both lights as a low level can affect the ABS sensors reading accurately.
* ABS Module Failure: The ABS module is a complex electronic component that controls the anti-lock braking system. It can fail internally, causing the lights to illuminate. This often requires professional diagnosis and potentially replacement of the module.
* Brake System Leaks: As mentioned above, a leak in any part of the braking system (lines, calipers, wheel cylinders) will lower the fluid level and activate the warning lights. This necessitates a thorough inspection of the entire braking system by a mechanic.
* Faulty Wheel Speed Sensor: The ABS system relies on wheel speed sensors to detect wheel slippage. A faulty sensor can cause the ABS and brake lights to illuminate. These sensors are located near the wheel hubs.
* Faulty Brake Light Switch: While less common, a faulty brake light switch can sometimes trigger these warning lights. This switch is located on the brake pedal assembly.
* Wiring Issues: Damaged or corroded wiring within the braking system or ABS system can disrupt signals and cause the lights to come on.
What to Do:
1. Check the brake fluid level immediately. If it's low, do not drive the truck until you've identified and repaired the leak.
2. Have the vehicle diagnosed by a qualified mechanic. They have the tools (OBD-II scanner) to read diagnostic trouble codes (DTCs) that can pinpoint the exact problem. Trying to fix this yourself without proper knowledge could be dangerous. The ABS system is complex and requires specialized tools and knowledge to repair safely.
Ignoring these warning lights is extremely dangerous. Driving with a malfunctioning braking system significantly increases the risk of an accident. Get your truck inspected and repaired as soon as possible.
