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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. What is the best way to test the low air pressure warning signal?
step on and off the brake pedal while the engine is running.
Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
pump the brakes until the air pressure drops below 45 psi.
All of the above.
2. When driving in hot weather, drivers should inspect tires:
every hour or every 50 miles.
every 3 hours or every 75 miles.
every 2 hours or every 100 miles.
every 4 hours or every 200 miles.
3. Brake drums or discs must not have cracks longer than ____ the width of the friction area.
4. When the wheels of a trailer lock up:
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
ABS will increase stopping power.
All of the above.
5. If your truck has automatic transmission, you should downshift:
when going down grades.
when you need to accelerate.
after entering a curve.
whenever road conditions allow.
6. Before starting down a hill, you should:
slow down and shift to a lower gear.
look for an escape route.
release the accelerator and shift to Neutral at the same time.
apply the brakes hard.
7. Air brakes use ________ to make the brakes work.
compressed gases
compressed oil
compressed air
compressed gas cylinders
8. It is not safe to drive a vehicle that has brake drums with cracks that are longer than ___ the width of the friction area.
9. Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = ?
Total Stopping Distance
Stopping Distance - (minus) Brake Fade Distance
Partial Stopping Distance
Total Air Pressure
10. To check the slack adjusters:
park downhill and see if the vehicle rolls.
check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
None of the above.
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CT CDL Air Brakes Test

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