MASSACHUSETTS 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 Massachusetts CDL knowledge test. The MA 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 Massachusetts CDL Manual. Take this MA CDL practice test now to prepare for the actual air brakes test!
1.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
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125 psi.
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450 psi.
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100 psi.
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250 psi.
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2.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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10 to 20 psi
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50 to 75 psi
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100 to 120 psi
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20 to 45 psi
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3.
A broken exhaust system:
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does not cause problems.
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can improve fuel efficiency.
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poses no threat to the driver.
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can let poisonous carbon monoxide to leak into the cab.
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4.
To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
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2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
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5.
Air storage tanks:
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hold compressed air for the brakes.
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use parts of the service brake systems to stop the vehicle in a brake system failure.
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pump air into the air storage tanks.
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are installed in the first tank the air compressor pumps air to.
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