VIRGINIA 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 Virginia CDL knowledge test. The VA 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 Virginia CDL Manual. Take this VA CDL practice test now to prepare for the actual air brakes test!
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1.
When driving in hot weather, drivers should inspect tires:
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every 4 hours or every 200 miles.
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every 3 hours or every 75 miles.
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every 2 hours or every 100 miles.
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2.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/4
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1/3
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1/2
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3.
Spring brakes:
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are air applied like service brakes.
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are not designed to work in an emergency when your service brakes fail.
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apply when air pressure leaves the brake chamber and release when air pressure builds up in the chamber.
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4.
Your vehicle has a dual air brake system. If one air system is very low on pressure, you should:
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call your dispatcher or supervisor for instructions.
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reduce your speed and check the low air pressure warning signal for the other system regularly.
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bring the vehicle to a safe stop, and have the air brakes system fixed.
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5.
The application pressure gauge shows:
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how much air pressure you are applying to the brakes.
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how much pressure is in the air tanks.
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All of the above.
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6.
Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
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anti-lock brakes.
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a rear backup camera.
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hydraulic brakes.
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7.
What is the best way to test the low air pressure warning signal?
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pump the brakes until the air pressure drops below 45 psi.
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Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
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step on and off the brake pedal while the engine is running.
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8.
You should NOT use the parking brakes if:
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the brakes are cold.
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the brakes are too dry.
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the brakes are very hot.
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9.
The supply pressure gauges tell you how much air pressure:
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you are applying to the brakes.
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is going to the brake chambers.
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is in the air tanks.
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10.
You supply air to the trailer brake system by:
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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connecting the tractor service air line to the trailer service glad hand.
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VA CDL Air Brakes Test
| Number of questions: | 25 |
| Correct answers to pass: | 20 |
| Passing score: | 80% |
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