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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 Delaware CDL knowledge test. The DE 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 Delaware CDL Manual. Take this DE CDL practice test now to prepare for the actual air brakes test!
1. With a dual air brake system:
each system has its own air tanks, hoses and lines.
one system is the main braking system while the other is a back-up system.
each system shares air tanks.
each system shares the same lines and hoses.
2. If an aggressive driver is involved in an accident down the road, you should:
confront the aggressive driver.
try to get their vehicle to the side of the road.
make eye contact with the driver.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
3. ABS helps you:
stop much faster.
avoid wheel lock up and maintain control of your vehicle when you brake.
steer gently and smoothly while you are braking.
increase your normal braking capability.
4. If a vehicle is equipped with ABS, when you start the engine:
the wheels will lock up.
the trailer emergency brakes will come on.
the ABS indicator light on the dash should come on and then turn off.
the spring brakes will come on.
5. Air brakes:
can improve fuel efficiency.
should be used only when driving on wet roads.
are prohibited on larger vehicles.
are an effective way to stop large and heavy vehicles.
6. The service brake applies and releases:
the brake when you use the brake pedal during normal driving.
the parking brake when you use the parking brake control.
the brake in an emergency situation.
None of the above.
7. Which of the following is NOT part of the air brake system?
Anti-lock brake system
Parking brake system
Service brake system
Emergency brake system
8. Brake fade results from:
excessive speeding.
excessive wear.
excessive smoke.
excessive use of the service brakes.
9. Dual tires:
should always come in contact with each other.
should not come in contact with each other.
should come in contact with each other whenever possible.
are dangerous.
10. To check the slack adjusters:
park downhill and see if the vehicle rolls.
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.
check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
None of the above.
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DE Air Brakes CDL Test

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