Manitoba Airbrake Practice Exam

What distinguishes conventional air brakes from an anti-lock braking system (ABS)?

1. ABS improves the stopping distance

2. ABS prevents wheel lock-up during hard braking

3. Conventional brakes are operated with less pressure

4. Conventional systems require more maintenance

The correct answer is: ABS prevents wheel lock-up during hard braking

The distinction between conventional air brakes and an anti-lock braking system (ABS) lies in the functionality of how they respond during braking situations. The correct answer reveals that ABS is specifically designed to prevent wheel lock-up when a driver applies hard braking. This is a critical safety feature, as wheel lock-up can lead to a loss of steering control and increased stopping distances. By modulating the brake pressure to each wheel, ABS allows the wheels to continue turning, maintaining traction and steering capability, which is especially beneficial on slippery or uneven surfaces. In contrast, conventional air brakes do not have this sophisticated technology; they can cause wheels to lock up under hard braking conditions, which can lead to compromised control of the vehicle. Hence, the function of ABS in preventing wheel lock-up is a fundamental aspect that sets it apart from traditional braking systems.