AIR BRAKES PRACTICE TEST - HAWAII
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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!
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1.
In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
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should not be removed.
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should be drained completely.
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should be added regularly.
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2.
How do you check that spring brakes come on automatically?
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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3.
What is a dual air brake system?
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2 separate air brake systems: one system for daytime driving, the other system for nighttime driving.
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2 separate air brake systems: one system operates the left brakes, the other system operates the right brakes.
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2 separate air brake systems: one system operates the front brakes, the other system operates the rear brakes.
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4.
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.
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1/2 inch
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1 inch
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2 inches
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5.
The __________ keeps air from going out if the air compressor develops a leak.
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tractor protection valve
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emergency relay valve
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one-way check valve
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6.
The air compressor governor controls:
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when air tank pressure falls below the “cut-out” level.
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when the air compressor will pump air into the air storage tanks.
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the air pressure applied to the brakes.
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7.
Brake fade results from:
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excessive wear.
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excessive speeding.
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excessive use of the service brakes.
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8.
In a vehicle with a dual air brake system:
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one system supplies air to the trailer.
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both systems typically operate the regular brakes on the rear axle.
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each system has its own air tanks.
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9.
Slack adjusters:
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should move more than one inch where the push rods attach to them.
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regulate the distance between the rear wheels.
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regulate the distance that the air brake has to travel to apply friction to the wheel.
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10.
In vehicles with air brakes, the brake pedal:
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tells you how much pressure is in
the air tanks.
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let the
air out of the spring brakes.
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controls the air pressure applied to the brakes.
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HI Air Brakes CDL Test
| Number of questions: | 25 |
| Correct answers to pass: | 20 |
| Passing score: | 80% |
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