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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Connecticut CDL knowledge test. The CT CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Connecticut CDL Manual. Take this CT CDL practice test now to prepare for the actual air brakes test!
1. Excessive use of the service brakes results in overheating. Too much heat can:
make the brakes stop working.
cause the brakes to grab.
cause the brakes apply unevenly.
cause the brakes to squeak.
2. Hydroplaning is more likely if:
tire pressure is low.
tire tread is worn.
the road is wet.
All of the above.
3. Having ABS on only the trailer:
makes the trailer more likely to swing out.
still gives you more control over your vehicle during braking.
makes the trailer more likely to roll over.
is very dangerous.
4. To make the brakes work, air brakes use:
compressed air.
hydraulic air.
carbon monoxide.
5. If you're feeling tired while driving you should:
increase your speed to get to your destination quicker.
drink coffee.
stop driving and get some rest.
eat something.
6. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
30 to 35 psi.
5 to 15 psi.
20 to 45 psi.
55 to 74 psi.
7. If your vehicle is hydroplaning, you should:
release the accelerator and push in the clutch.
accelerate to get through the water as quickly as possible.
use the brakes to slow down.
None of the above.
8. You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
The brake pedal feels spongy or goes to the floor.
You hear a loud "bang".
You have to apply your brakes harder and harder to get the same stopping power.
The steering feels heavy.
9. Which of the following is NOT a reason for hydraulic brake failure?
Brake fade on long hills
Loss of hydraulic pressure
Stab braking
All of the above.
10. If your vehicle has an alcohol evaporator, every day during cold weather, you should:
fill it up with oil to prevent alcohol from freezing.
check the alcohol container and fill up as necessary.
ensure that compressed air usually has some water and some  compressor oil in it.
fill it up with oil to prevent the pipes from freezing.
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CT CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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