COLORADO CDL AIR BRAKES PRACTICE TEST
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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 Colorado CDL knowledge test. The CO 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 Colorado CDL Manual. Take this CO CDL practice test now to prepare for the actual air brakes test!
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1.
_________ must have a low air pressure warning signal.
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Vehicles with air brakes built after 2010
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Vehicles with air brakes built after 2005
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All vehicles with air brakes
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Only vehicles with air brakes built before 2015
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2.
The low pressure warning signal will generally activate when the air pressure falls between:
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85–100 psi.
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55–75 psi.
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80–85 psi.
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30–35 psi.
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3.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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10, 100 and 200 feet
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5, 50 and 500 feet
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5, 25 and 50 feet
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3, 15 and 45 feet
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4.
Front brake limiting valves were used to:
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce your speed so further braking or shifting is not required.
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reduce exhaust emissions.
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prevent overheating of the front tires.
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5.
How many reflective triangles/emergency reflectors should you carry?
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4
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1
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2
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3
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6.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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place the cargo near the front of the trailer.
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place the cargo near the rear of the trailer.
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put the lightest parts of the cargo under the heaviest parts.
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7.
Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
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Wheel speed sensor wires are coming from the back of the brakes.
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It was built after March 1, 1998.
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The letters "ABS" are printed on the side of the steering wheel.
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It has yellow ABS malfunction lamps.
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8.
The safety valve is usually set to open at:
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75 psi.
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150 psi.
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100 psi.
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200 psi.
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9.
To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
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If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
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All trucks have air brakes.
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If you don't, you will only receive a CDL permit.
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If you don't pass the air brakes test, you can't get a CDL.
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10.
To check the slack adjusters:
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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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.
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park downhill and see if the vehicle rolls.
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None of the above.
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CO CDL Air Brakes Test
| Number of questions: | 25 |
| Correct answers to pass: | 20 |
| Passing score: | 80% |
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