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Look under the trailer for wheel speed sensors coming from the back of the brakes.
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Look under the hood for the ABS sticker.
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Look at the tires.
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Remove a tire and look for the ABS sensor on the axle.
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District Of Columbia CDL Permit Test - Knowledge Test Class A
(From the 2021 District Of Columbia CDL driver handbook)
| Number of questions: | 50 |
| Passing score: | 40 |
Directions:
This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has four possible answer choices. Test questions come from the Washington D.C. Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination, Doubles and Hazardous Materials. Endorsements that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.
Passing grade —
10 or fewer errors
advertising
1.
To confirm that a trailer has ABS, you can:
2.
When checking the air and electrical lines during a vehicle inspection, all of the following should be true, except:
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The air hoses are making a hissing noise.
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The air hoses and electrical lines are not cut.
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The air lines are not pinched.
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The air lines are not dragging against tractor parts.
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3.
When driving, keeping space between your vehicle and other vehicles is:
|
Not important.
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Important.
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A waste of time.
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Optional.
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4.
What is a tire load?
|
The minimum safe weight a tire can carry
|
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The maximum safe weight a tire can carry
|
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The weight of a tire
|
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The weight of the air within a fully inflated tire
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5.
What are placards?
|
Signs placed on a vehicle to identify cargo hazards
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A type of tire used in snowy conditions
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Logs kept inside the vehicle
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Journals for mileage
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6.
When conducting a vehicle inspection, you will need to identify all of the following, except:
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The power steering belt.
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The water pump belt.
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The alternator belt.
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The water compressor belt.
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7.
After a vehicle is started, warning lights and buzzers:
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Should stay on for several minutes.
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Should turn off within a few seconds.
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Should stay on until manually turned off.
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Should remain on.
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