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Hawaii
Hawaii CDL Air Brakes 1
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Q.1
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In a dual air brake system:
Air tanks are shared between both systems.
Each system has its own air tanks.
You must designate which system you are using.
Q.2
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What is brake lag?
The time required for the brakes to work after the brake pedal is pressed
The distance between the brake pedal and the floor
The amount of air pressure used to stop the vehicle
Q.3
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When an S-cam turns inside a brake drum, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
Q.4
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The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
8 psi
5 psi
3 psi
Q.5
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Lights that indicate that anti-lock brakes are not working are:
Gray.
Blue.
Yellow.
Q.6
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On flat surfaces, wheel chocks:
Can be used to prevent a parked vehicle from moving.
Make it easier for a parked vehicle to roll.
Should only be used on the front driver's side tire.
Q.7
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An application pressure gauge shows:
How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.
Q.8
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When operating a vehicle with a dual air brake system, the driver should:
Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
Q.9
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Brakes out of adjustment will:
Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
Q.10
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Failing to drain air tanks could result in:
Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.
Q.11
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If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.
55 and 75 psi.
80 and 95 psi.
65 and 100 psi.
Q.12
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If the safety relief valve in the air brake system releases air:
The compressor needs more air.
The air pressure has become too high.
The brakes are fully operational.
Q.13
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Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:
Stop the compressor from pumping air.
Release air from the tanks.
Begin pumping air into the tanks.
Q.14
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Air tank drains:
Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.
Q.15
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Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
One half
One third
One fifth
Q.16
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When you are about to start down a hill, you should switch into a ____ gear.
Higher
Faster
Lower
Q.17
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During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.
2 psi
4 psi
6 psi
Q.18
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What does an air compressor do in an air brake system?
It pumps air into the air storage tanks.
It fills the tires.
It moves air to the back of the truck.
Q.19
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____ make up the emergency brake system.
Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems
Q.20
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The ____ are activated by an electric switch that is triggered by the brake pedal.
Headlights
Turn signals
Brake lights
Q.21
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When parking, you should not use the parking brake if:
The brakes are very hot.
The brakes are very cold.
There is snow on the ground.
Q.22
Submit
Brakes can get out of adjustment quickly, especially:
If they are hot.
In the winter time.
If they are used frequently.
Q.23
Submit
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
Green
Blue
Yellow
Q.24
Submit
ABS brakes:
Help you avoid wheel lockup.
Lock up your vehicle's wheels.
Prevent your vehicle from accelerating when going uphill.
Q.25
Submit
A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch
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