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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. When backing a trailer, you should:
avoid correcting the drift.
turn the steering wheel in the direction you want to go.
never make pull-ups to reposition your vehicle.
try to position your vehicle so you can back in a straight line.
2. To check the slack adjusters on S-cam brakes, you should:
park on level ground, chock the wheels and release the parking brakes, then use gloves and pull hard on each slack adjuster that you can reach.
release the parking brake valve and begin reducing the air pressure by stepping on and off the brake pedal.
park on level ground and fan off the air pressure by rapidly applying and releasing the foot brake.
All of the above.
3. Which of the following is NOT part of the drum brake?
Return spring
Safety valve
Brake drum
4. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
5. When you pull hard on a slack adjuster and it moves more than about _____ where the push rod attaches to it, the slack adjuster probably needs adjustment.
1/4 inch
1 inch
1/2 inch
2 inches
6. ABS brakes help you:
downshift before starting down a hill.
avoid wheel lock up.
find an escape route when the service brakes fail.
lock up the wheels in an emergency stop.
7. It may not be safe to operate at legal maximum weights:
on two-way streets.
on highways.
in hot weather.
during bad weather or in mountains.
8. In a vehicle with a dual air brake system:
each system has its own air tanks.
both systems typically operate the regular brakes on the rear axle.
one system supplies air to the trailer.
All of the above.
9. ABS helps you:
steer gently and smoothly while you are braking.
increase your normal braking capability.
stop much faster.
avoid wheel lock up and maintain control of your vehicle when you brake.
10. Spring brakes:
are usually held back by air pressure.
will apply the brakes when a leak in the air brake system causes all the air to be lost.
will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
All of the above.
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CT Air Brakes CDL 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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