NM 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 New Mexico CDL knowledge test. The NM 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 New Mexico CDL Manual. Take this NM CDL practice test now to prepare for the actual air brakes test!
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1.
How do you check that spring brakes come on automatically?
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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2.
When going down grades, you should:
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shift up.
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put the transmission in Neutral.
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downshift to a lower gear.
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3.
If a load is 10 feet long, the minimum number of tie-downs required is:
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3
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2
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1
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4.
The trailer hand valve should:
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never be used to test the trailer brakes.
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be used in driving.
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never be used for parking.
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5.
Rough acceleration:
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is necessary to warm up the engine.
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improves gas mileage.
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can cause mechanical damage.
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6.
Passive railroad crossings:
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should never be crossed using a CMV.
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have at least one traffic control device.
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do not have traffic control devices.
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7.
The safety valve is usually set to open at:
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125 psi
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200 psi
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150 psi
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8.
How should you apply the brakes when going down a steep downgrade?
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Apply the brakes as hard as you can without locking the wheels.
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Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
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Apply the brakes when you reach the bottom of the downgrade.
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9.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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air escaping from the open valve.
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a mechanical vibration.
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the service line valve close.
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10.
If the spring brakes do not release when you push the trailer air supply control, you should:
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rev or
lug the engine.
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check the electrical cables.
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check the air line connections.
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NM CDL Air Brakes Test
| Number of questions: | 25 |
| Correct answers to pass: | 20 |
| Passing score: | 80% |
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