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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. You are driving on a steep downgrade. If your safe speed is 35 mph, you should apply the brakes when your speed reaches:
25 mph
35 mph
30 mph
2. When the air pressure is built up to governor cutoff, the air leakage rate for combination vehicles with the engine off and the foot brake fully applied should be less than_____ in one minute.
4 psi
2 psi
3 psi
3. Brake drums or discs must not have cracks longer than ____ the width of the friction area.
4. To check the slack adjusters:
Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
park downhill and see if the vehicle rolls.
check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
5. While driving, you should use your mirrors to:
check where the rear of your vehicle is while you make turns.
know where other vehicles are around you.
All of the above.
6. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
55 to 74 psi.
5 to 15 psi.
20 to 45 psi.
7. During a trip you should check:
pressure gauges.
temperature gauges.
All of the above.
8. The heavier the vehicle:
the more work the brakes must do to stop it.
the less work the brakes must do to stop it.
the higher the center of gravity will be.
9. Which of the following is NOT correct? An ABS system:
helps you stop faster.
is a safety anti-skid braking system.
helps you avoid wheel lock up.
10. The most common type of brake is the:
S-cam drum brake
G-cam disc brake
R-cam drum brake
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HI CDL Air Brakes Test

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