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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 Arkansas CDL knowledge test. The AR 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 Arkansas CDL Manual. Take this AR CDL practice test now to prepare for the actual air brakes test!
1. If your tires are hot, you should NOT:
once the tires have cooled down, make another stop to check the tires.
stop to let the tires cool down.
let air out of the tires so the pressure goes back to normal.
drive until you correct the cause of the overheating.
2. The trailer hand valve should:
be used in driving.
never be used to test the trailer brakes.
never be used for parking.
All of the above.
3. To check that spring brakes come on automatically, the first thing to do is to:
turn off the engine, release the parking brake and time the air pressure drop.
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.
All of the above.
4. Air tanks must be drained completely to:
pump water and compressor oil into the tanks.
remove all moisture and oil.
put alcohol into the air system.
remove all the air.
5. When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
When you are conducting your pre-trip inspection.
Only while you are taking a rest break.
When the tank pressure falls to the "cut-in" pressure.
6. In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
7. Air tank drains:
should not be used in wet weather.
protect the tanks and the rest of the system from too much pressure.
are used to remove water and oil from the air tanks.
are used to move air to the brakes.
8. With a dual air brake system:
each system shares the same lines and hoses.
one system is the main braking system while the other is a back-up system.
each system has its own air tanks, hoses and lines.
each system shares air tanks.
9. You should always try to back toward the driver's side because:
backing toward the left side is more dangerous.
you can watch the rear of your vehicle out the side window.
you can more easily correct any steering errors.
None of the above.
10. Emergency brakes are:
not required on doubles.
not required on commercial vehicles with air brakes.
not required on buses.
required on all vehicles.
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AR CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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