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Braking will only be possible if there is still enough air in the tanks.
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You can apply the brakes 14 times before the air in the system runs out.
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You should continue to drive normally and check the brake system when it is convenient.
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You should stay at least 100 feet away from other vehicles.
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District Of Columbia CDL Permit Test - Double
(From the 2021 District Of Columbia CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 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: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
Passing grade —
4 or fewer errors
advertising
1.
If the low pressure warning light comes on while you are driving:
2.
After connecting the air lines to the trailer while coupling, you should:
|
Supply air to the trailer.
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Chock the wheels.
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Inspect the fifth wheel.
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Connect the electrical cord.
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3.
When traction is poor, a driver should accelerate slowly:
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Because it is best to always accelerate very slowly.
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So they do not lose control of their vehicle.
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So the driver does not accelerate faster than the vehicle ahead.
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To be the last vehicle through an intersection.
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4.
If the spring brakes are activated, you should never:
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Push down the brake pedal.
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Open the hood.
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Release air from the air storage tanks.
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Open the door to the cab.
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5.
A vehicle inspection is required:
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For insurance purposes.
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To get fuel.
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By state and federal law.
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6.
When stopped on the side of the road, the driver should:
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Keep their side door open.
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Turn on their emergency flashers.
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Wave their arms.
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Turn off all their lights.
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7.
Friction inside a brake drum is caused when the brake shoes and linings:
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Push against each other.
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Separate from the axle.
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Push against the inside of the drum.
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Create excess heat.
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