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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. To control your speed on a downgrade, you should:
use controlled braking.
coast in neutral.
use engine braking.
fully apply the brakes.
2. When coupling, you should:
make sure the trailer kingpin is bent.
make sure the trailer wheels are not chocked.
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the sliding fifth-wheel is locked.
3. Which of the following is not a braking system on a truck?
Parking brake
Steering brake
Service brake
Emergency brake
4. If a vehicle is equipped with ABS, when you start the engine:
the ABS indicator light on the dash should come on and then turn off.
the trailer emergency brakes will come on.
the wheels will lock up.
the spring brakes will come on.
5. If the drive wheels begin to spin when accelerating, you should:
take your foot off the accelerator.
brake gently.
set the parking brake.
continue to accelerate.
6. When the spring brakes are on, you should never:
push the brake pedal down.
change lanes.
decrease your speed.
7. After starting the engine, oil pressure should rise to a normal level:
within 6 minutes.
within 3 miles.
within seconds.
within 2 minutes.
8. Which of the following is a reason why air tanks must be drained?
The governor may stop the compressor from pumping air.
Your battery fluid may drain out.
Your brakes may fail due to the water freezing.
Your transmission fluid may drain out.
9. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
it is a safe-driving brake.
it applies a "Shock" to the brakes.
it is shaped like the letter "S".
"S" stands for "Shoes".
10. An alcohol evaporator:
used to reduce the chance of the front wheels skidding.
is used to reduce the risk of ice in air brake valves and other parts during cold weather.
protects the air brake system from too much pressure.
to hold compressed air.
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MA Air Brakes CDL Test

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