CDL Air Brakes TestAir Brake System PartsEasy
An anti-lock braking system (ABS) is a critical safety feature in modern commercial vehicles. What is the primary function of ABS in an air brake system?
- ATo prevent wheel lock-up during hard braking.
- BTo reduce the stopping distance on dry pavement.
- CTo increase the maximum air pressure in the brake tanks.
- DTo automatically engage the parking brake when the vehicle stops.
Show answer & explanationAnswer & explanation
Correct answer: A. To prevent wheel lock-up during hard braking.
The primary function of ABS is to prevent the wheels from locking up during hard braking, especially on slippery surfaces. This allows the driver to maintain steering control and often reduces stopping distances, particularly on wet or icy roads.
Why the other options are wrong
- B. While ABS can improve stopping distance in some conditions (especially slippery ones), its primary function is control by preventing lock-up, not necessarily reducing stopping distance on dry pavement where locked wheels might stop faster but with no control.
- C. ABS does not control or increase the system's maximum air pressure.
- D. Automatic parking brake engagement is not a function of ABS.
Anti-lock Braking System (ABS)
ABS is a safety system that prevents wheel lock-up during braking, allowing the driver to maintain steering control.
- Prevents skidding.
- Enhances vehicle control.
- Works by rapidly modulating brake pressure to individual wheels.
Memory trick: ABS: Always Better Steering.