Utah CDL — Air Brakes practice
Handling Emergencies
What to do when things go wrong — brake failure, tire blowouts, skids, and stalling on railroad tracks.
Content reviewed against official driver handbooks · July 7, 2026
7 questions · pass with 6 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
7 sample Handling Emergencies questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
1. What is a key benefit ABS gives you during hard braking?
Correct answer: You can steer around an obstacle while braking
ABS may not stop you any faster, but by preventing lockup it lets you keep steering control to maneuver around a hazard.
Source: 5.4.2 Braking with Antilock Brakes
2. Why shouldn't you keep driving until the spring brakes engage on their own?
Correct answer: You should stop while you can still control the brakes
When the low-air warning first appears, stop promptly while you still have brake control rather than waiting for the spring brakes to grab.
Source: 5.1.14 Spring Brakes
3. During stab braking, when should you reapply the brakes after releasing them?
Correct answer: As soon as the wheels start rolling again
In stab braking you release when the wheels lock, then reapply fully only once the wheels begin turning again.
Source: 5.4.3 Emergency Stops
4. Why can a heavily loaded truck roll a long way before stopping once the spring brakes come on?
Correct answer: The spring brakes don't act on every axle
Spring brakes don't work on all axles, so a heavy load can travel a long way before it stops.
Source: 5.4.7 Low Air Pressure
5. If the low-air-pressure warning comes on while you are driving, what should you do?
Correct answer: Bring the vehicle to a safe stop and park it
The warning may mean a leak, so you should bring the vehicle to a safe stop and park it right away.
Source: 5.4.7 Low Air Pressure
6. After you release the brakes during stab braking, how long can it take for the wheels to start rolling again?
Correct answer: Up to about one second
It can take as long as a second for the wheels to begin rolling; reapplying too soon keeps the vehicle from straightening out.
Source: 5.4.3 Emergency Stops
7. What describes the 'controlled braking' method during an emergency?
Correct answer: Braking as hard as possible without locking the wheels
Controlled braking means applying as much brake as you can without letting the wheels lock, keeping steering inputs small.
Source: 5.4.3 Emergency Stops
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