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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 parking brake:
should be used whenever you park.
should be used when driving in bad weather.
should be used when you need to apply the brakes firmly.
All of the above.
2. If your truck catches fire, the first thing you should do is to:
pull into a service station and call for help.
pull off the road and park in an open area.
get the vehicle off the road and park near other vehicles.
get off the vehicle, open the hood and start shooting foam to keep the engine cool.
3. Most heavy-duty vehicles use:
hydraulic brakes.
solid brakes.
air brakes.
pressure brakes.
4. If air doesn't flow all the way to the back:
a rollover is more likely.
your brakes will not work properly.
the trailer will tend to swing around.
your lower fifth wheel may fall off.
5. The safety valve is usually set to open at:
200 psi.
75 psi.
150 psi.
100 psi.
6. If your vehicle is equipped with a front brake limiting valve, to ensure normal stopping power make sure the control is:
in the "off" position.
in the "slippery" position.
in the "normal" position.
in the "neutral" position.
7. Which of the following is TRUE about dual air brake systems?
Each brake system has its own air tanks, hoses and lines.
most heavy-duty vehicles use dual air brake systems.
A dual air brake system has 2 separate air brake systems.
All of the above.
8. Your vehicle has air brakes. To stop, you should:
release the accelerator, push in the clutch, and shift to Neutral at the same time.
pump the brake pedal 3 times.
push the brake pedal down.
pull the parking brake control knob out.
9. The air compressor governor:
controls when the air storage tanks will pump air into the air compressor.
allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
stops the compressor from pumping air.
All of the above.
10. You should check air pressure and temperature gauges:
every time you stop.
as often as is practical.
at the end of each trip.
at the beginning of each trip.
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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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