This is our Hawaii Air Brakes Practice Quiz and Practice Test compiled of 25 questions each. Each question is worth four points for a total of 100 possible points. A passing score is 80%.
The Air Brakes Practice Quiz reveals the correct answer during each question to help you study for the actual Air Brakes exam. The Air Brakes Practice Test doesn’t reveal the correct answers until the test is over.
The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy.
Press the start button to begin your free Air Brakes Practice Quiz. Good luck!
What does it mean when the safety valve releases air?
A
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
B
All of these.
C
The air pressure has exceeded 150 psi.
D
There is way too much air in the air compressor.
Question 2
Are front wheel brakes good under all conditions?
A
No.
B
Only if they are drum brakes.
C
Only if they are disc brakes.
D
Yes.
Question 3
In an air brake system, the air compressor pumps air into the ______.
A
storage tanks
B
brake system
C
air tank drains
D
hydraulic brakes
Question 4
In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.
A
three, sixty
B
one, thirty
C
two, sixty
D
one, sixty
Question 5
Air tanks must be drained to:
A
prevent someone from moving the vehicle.
B
completely empty air out of the tank.
C
prevent them from freezing during cold temperatures.
D
drain oil and moisture from the tank.
Question 6
The service brake system:
A
is only found on automobiles with hydraulic brakes.
B
is known as an official vehicle inspection.
C
is only on automobiles with hydraulic brakes.
D
applies and releases the vehicle's brakes using the brake pedal.
Question 7
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A
governor.
B
application pressure gauge.
C
air tank drain.
D
safety valve.
Question 8
The air storage tanks are used to hold ______.
A
oxygen and helium
B
compressed gas
C
nitrogen and oxygen
D
compressed air
Question 9
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 10
The supply pressure gauge is used for what purpose?
A
To let you know how much diesel fuel is in the vehicle.
B
To let you know how much oxygen is in the air tanks.
C
To let you know how much water is in the air tank.
D
None of these.
Question 11
Air brake systems are a combination of which three braking systems?
A
The service brake system, manual brake system, and disc brake system.
B
The disc brake system, drum brake system, and foundation brake system.
C
The emergency brake system, parking brake system, and foundation brake system.
D
The parking brake system, service brake system, and emergency brake system.
Question 12
What is a good indication that your truck's single brake system needs to be adjusted?
A
When pressure increases from 50 to 75 psi within three minutes.
B
When pressure increases from 85 to 100 psi within 45 seconds.
C
When the governor switch stops between 75 to 90 psi.
D
When the compressor shuts off between 70 to 90 psi.
Question 13
What two substances usually found in compressed air are harmful to the brake system?
A
Compressed air does not contain any of these substances.
B
Water and compressor oil.
C
Dust and water.
D
Dust and compressor oil.
Question 14
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
s-cam, shoes
B
coil, boots
C
pressure valve, boots
D
valve spring, shoes
Question 15
The most common type of foundation brakes are ______ brakes.
A
shoe
B
disc
C
wedge
D
s-cam drum
Question 16
When should the air tanks be drained?
A
Once a day.
B
Every 1,000 miles.
C
Before every trip.
D
Once a week.
Question 17
Compressed air is let out of the system by ______.
A
letting up on the brake pedal
B
pushing down on the brake pedal
C
activating the emergency brake
D
activating the parking brake
Question 18
What will happen if your air compressor stops working?
A
Your brakes will instantly lock up.
B
You will instantly lose braking power.
C
You will still have some air pressure left in the air tanks.
D
Nothing will happen.
Question 19
Brake drums are:
A
all of these.
B
bolted securely to the wheels.
C
located on either end of the vehicle's axles.
D
used to hold the brake shoes and linings.
Question 20
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
reduce the risk of ice in the air brake valves
B
remove oil from the air lines
C
evaporate any alcohol, which can damage the brake system
D
remove fuel from the air lines
Question 21
Spring brakes are ______.
A
the spring that is attached to the brake pedal
B
springs that press the brakes on to stop the vehicle if the air brakes leak out
C
used for parking
D
specialized brakes only to be used during warm weather
Question 22
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, parking brake systems
B
service brake, emergency brake systems
C
disc brake, emergency brake systems
D
disc brake, parking brake systems
Question 23
When should the parking brake not be used?
A
When the air pressure is low.
B
When the temperature is below freezing.
C
When the brakes are hot.
D
When the combined weight of your truckload and vehicle exceeds five tons.
Question 24
What should you do when you see the low pressure warning?
A
Safely bring the automobile to a stop while you still have control over the brakes.
B
Check your air pressure gauge and drive at highway speeds.
C
Pump the brake pedal hard until you come to a stop.
D
Stay calm and wait for the air brakes to come on automatically.
Question 25
The safety valve in the air compressor tank should open at ______ psi.
A
125
B
175
C
150
D
200
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Remember, the Air Brakes Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.
Press the start button to begin your free Air Brakes Practice Test. Good luck!