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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 Hawaii CDL knowledge test. The HI 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 Hawaii CDL Manual. Take this HI CDL practice test now to prepare for the actual air brakes test!
1. Foundation brakes are used:
only with the right wheels.
only with the front wheels.
at each wheel.
2. Rough acceleration:
can cause mechanical damage.
is necessary to warm up the engine.
improves gas mileage.
3. At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________  to be sure it is safe to proceed.
stop, look, and listen
listen, look and stop
go, stop and listen
4. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
the rear trailer of a triple.
strong wind.
rearward amplification.
5. Supply pressure gauges tell you:
when the air pressure in the tanks falls below 60 psi.
how much pressure is in the air tanks.
how much air pressure you are applying to the brakes.
6. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line causes:
the trailer emergency brakes to come on.
the speed of your vehicle to increase.
the trailer spring brakes to come on.
7. When should you downshift automatic transmissions?
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you start to get drowsy.
When going down steep grades.
8. If your truck has automatic transmission, you should downshift:
whenever road conditions allow.
after entering a curve.
when going down grades.
9. If the low air pressure warning light comes on, you should:
continue to drive normally.
stop immediately.
call for help.
10. Which of the following statements is true?
Poor cargo ventilation is a common cause of fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
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HI CDL Air Brakes Test

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