Colorado CDL Practice Test

An Antilock Braking System (ABS) is designed primarily to prevent wheel lock-up during braking. When a driver applies the brakes, especially in emergency situations, the system monitors the speed of each wheel. If it detects that a wheel is about to lock up, ABS modulates the brake pressure. This means it quickly releases and reapplies the brakes at a rapid pace, preventing the wheels from completely locking. This functionality not only helps maintain steering control during hard braking but also significantly increases vehicle stability, thereby enhancing safety.

The system serves as a vital communication tool by informing the driver through pedal feedback when it is actively working to prevent wheel lock-up, creating a pulse-like sensation in the brake pedal. This informs the driver that the ABS is engaged, allowing them to maintain control of the vehicle.

While other systems and methods may contribute to braking performance and vehicle safety, the primary role of ABS specifically centers around preventing wheels from locking during braking, making the identified answer the most aligned with the core function of ABS.