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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. It may not be safe to operate at legal maximum weights:
on two-way streets.
during bad weather or in mountains.
in hot weather.
on highways.
2. A driver distraction is anything that takes your attention away from driving, such as:
adjusting the radio.
All of the above.
3. Empty trucks have the best braking. True or False?
It depends on the truck.
It depends on the cargo.
4. One way to prevent hydroplaning is to:
take curves at higher speeds.
make sure you have enough tread on your tires.
have less than 4/32 inch tread depth in every major groove on front tires.
use the controlled braking method.
5. If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?
Once a week.
At the end of each working day.
At least once a month.
Every 4 hours.
6. With a fully-charged air system, the leakage rates should be less than:
2 psi for single vehicles and 3 psi for a combination of two vehicles.
5 psi for single vehicles and 4 psi for a combination of two vehicles.
3 psi for single vehicles and 4 psi for a combination of two vehicles.
5 psi for single vehicles and 10 psi for a combination of two vehicles.
7. The low air pressure warning light is usually:
8. Front-end header boards:
protect drivers from spilled cargo.
reduce traction.
should never be used.
protect drivers from cargo in case of an accident or emergency stop.
9. When you pull hard on a slack adjuster and it moves more than about _____ where the push rod attaches to it, the slack adjuster probably needs adjustment.
1/4 inch
2 inches
1 inch
1/2 inch
10. To test the low pressure warning signal, you should:
check the air hoses connected to the brake chambers to make sure they aren't cut.
shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
manually let the air out of your brakes and see if the signal comes on.
pump the brakes while your vehicle is running.
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MA CDL Air Brakes Test

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