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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!
1. To test the service brake:
gently try to pull forward with the trailer parking brake on, then release the brake.
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
push the brake pedal firmly while going about 5 mph.
2. Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary systems should be at least:
100 psi.
75 psi.
130 psi.
3. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
10, 100 and 200 feet
5, 25 and 50 feet
5, 50 and 500 feet
4. When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
Only while you are taking a rest break.
When you are conducting your pre-trip inspection.
5. If your vehicle has an alcohol evaporator, every day during cold weather, you should:
fill it up with oil to prevent alcohol from freezing.
fill it up with oil to prevent the pipes from freezing.
check the alcohol container and fill up as necessary.
6. An ABS system:
gives you more control over the vehicle during braking.
helps you avoid skids caused by over braking.
All of the above.
7. If your brakes fail while you are driving on a downgrade, you should:
take the least hazardous escape route you can.
use an escape ramp if it's available.
All of the above.
8. The braking power of the spring brakes:
is not affected by the condition of the service brakes.
depends on the brakes being in adjustment.
is not affected by the air pressure level.
9. To check that spring brakes come on automatically, the first thing to do is to:
continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
turn off the engine, release the parking brake and time the air pressure drop.
10. Your vehicle has air brakes. To stop, you should:
pull the parking brake control knob out.
push the brake pedal down.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
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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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