Michigan CDL - Air Brakes Practice Exam

What is the primary function of Anti-Lock Braking Systems (ABS) during hard brake pedal applications?

1. To reduce overall braking power

2. To prevent wheels from locking up

3. To increase vehicle speed

4. To enhance driving comfort

The correct answer is: To prevent wheels from locking up

The primary function of Anti-Lock Braking Systems (ABS) during hard brake pedal applications is to prevent the wheels from locking up. When a driver applies the brakes forcefully, there's a risk that the wheels may stop rotating entirely, which can lead to a loss of steering control and increases the chance of skidding. ABS works by automatically modulating the brake pressure on each wheel, allowing the wheels to continue turning while still applying sufficient braking force. This system helps maintain traction and steering control, which is essential for safe maneuvering during emergency stops or adverse driving conditions. By preventing the wheels from locking up, ABS significantly reduces the likelihood of skidding and enhances vehicle stability, allowing the driver to steer while braking. This capability is crucial in maintaining safety on the roads, particularly in situations where quick and controlled stopping is necessary.