CDL Combination Vehicles TestCombination Vehicle Air BrakesMedium
You are making a full stop in a combination vehicle equipped with ABS. You encounter an unexpected patch of ice. What is the correct way to brake in this situation?
- ARelease the brake pedal and steer around the ice.
- BPump the brake pedal lightly to avoid skidding.
- CApply firm, steady pressure to the brake pedal.
- DApply the parking brake briefly to activate ABS.
Show answer & explanationAnswer & explanation
Correct answer: C. Apply firm, steady pressure to the brake pedal.
With ABS, the correct technique for emergency braking is to apply firm, steady pressure to the brake pedal. The ABS system will automatically modulate brake pressure to prevent wheel lock-up, allowing you to maintain steering control.
Why the other options are wrong
- A. Releasing the brake pedal and steering might be appropriate for avoidance if there's space, but for stopping on ice, firm braking with ABS is key.
- B. Pumping the brake pedal is incorrect with ABS; it interferes with the system's ability to modulate pressure.
- D. Applying the parking brake is for parking, not for emergency stopping, and will not activate the service brake ABS.
ABS Emergency Braking Technique
When driving a vehicle equipped with ABS, the correct technique for emergency braking is to apply firm and steady pressure to the brake pedal, allowing the ABS to prevent wheel lock-up and maintain steering control.
- Apply firm, steady brake pressure.
- Do not pump the brakes.
- Allows steering control during braking.
Memory trick: ABS on ice, steady pressure, safe and precise.