CO 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.
The __________ keeps air from going out if the air compressor develops a leak.
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emergency relay valve
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air compressor drive belt
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tractor protection valve
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one-way check valve
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2.
Before leaving your vehicle unattended, you should:
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Chock the wheels.
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Apply the parking brake.
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Remove the keys.
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All of the above.
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3.
To control your speed on a downgrade, you should:
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use controlled braking.
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use engine braking.
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fully apply the brakes.
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coast in neutral.
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4.
When the spring brakes are on, you should push the brake pedal down:
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Only when driving downhill.
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Never.
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Only when driving uphill.
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Only when approaching railroad-highway crossings.
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5.
Empty trucks have the best braking. True or False?
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It depends on the truck.
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It depends on the cargo.
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False.
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True.
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6.
Slack adjusters:
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are used to adjust the brakes on an air-brake system.
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are the linkage between the operating rod in the brake chamber and drum brakes or disk brakes in an air brake system.
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regulate the distance that the air brake has to travel to apply friction to the wheel.
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All of the above.
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7.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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driving in cold weather.
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relying too much on the engine braking effect.
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excessive downshifting.
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loss of hydraulic pressure.
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8.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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a mechanical vibration.
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a thumping sound.
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air escaping from the open valve.
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the service line valve close.
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9.
Air pressure should build up in a single air system, within about:
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10 minutes.
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15 minutes.
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1 minute.
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3 minutes.
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10.
An ABS system:
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helps you avoid skids caused by over braking.
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gives you more control over the vehicle during braking.
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keep your wheels from locking when you brake hard.
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All 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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