This is our Minnesota 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!
In an air brake system, the air compressor pumps air into the ______.
A
storage tanks
B
air tank drains
C
brake system
D
hydraulic brakes
Question 2
What will happen if your air compressor stops working?
A
You will still have some air pressure left in the air tanks.
B
Nothing will happen.
C
You will instantly lose braking power.
D
Your brakes will instantly lock up.
Question 3
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
evaporate any alcohol, which can damage the brake system
C
remove oil from the air lines
D
remove fuel from the air lines
Question 4
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 water is in the air tank.
C
To let you know how much oxygen is in the air tanks.
D
None of these.
Question 5
Compressed air is let out of the system by ______.
A
activating the emergency brake
B
pushing down on the brake pedal
C
activating the parking brake
D
letting up on the brake pedal
Question 6
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
coil, boots
B
pressure valve, boots
C
valve spring, shoes
D
s-cam, shoes
Question 7
Brake drums are:
A
located on either end of the vehicle's axles.
B
bolted securely to the wheels.
C
used to hold the brake shoes and linings.
D
all of these.
Question 8
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 9
When should the air tanks be drained?
A
Before every trip.
B
Every 1,000 miles.
C
Once a week.
D
Once a day.
Question 10
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A
safety valve.
B
governor.
C
application pressure gauge.
D
air tank drain.
Question 11
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
True
B
False
Question 12
Are front wheel brakes good under all conditions?
A
Only if they are disc brakes.
B
Only if they are drum brakes.
C
Yes.
D
No.
Question 13
Air tanks must be drained to:
A
drain oil and moisture from the tank.
B
prevent someone from moving the vehicle.
C
prevent them from freezing during cold temperatures.
D
completely empty air out of the tank.
Question 14
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, parking brake systems
B
disc brake, emergency brake systems
C
service brake, emergency brake systems
D
disc brake, parking brake systems
Question 15
The air storage tanks are used to hold ______.
A
nitrogen and oxygen
B
compressed gas
C
compressed air
D
oxygen and helium
Question 16
The safety valve in the air compressor tank should open at ______ psi.
A
125
B
200
C
175
D
150
Question 17
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 parking brake system, service brake system, and emergency brake system.
C
The disc brake system, drum brake system, and foundation brake system.
D
The emergency brake system, parking brake system, and foundation brake system.
Question 18
The service brake system:
A
is known as an official vehicle inspection.
B
is only on automobiles with hydraulic brakes.
C
applies and releases the vehicle's brakes using the brake pedal.
D
is only found on automobiles with hydraulic brakes.
Question 19
Spring brakes are ______.
A
the spring that is attached to the brake pedal
B
specialized brakes only to be used during warm weather
C
springs that press the brakes on to stop the vehicle if the air brakes leak out
D
used for parking
Question 20
What two substances usually found in compressed air are harmful to the brake system?
A
Water and compressor oil.
B
Dust and compressor oil.
C
Compressed air does not contain any of these substances.
D
Dust and water.
Question 21
When should the parking brake not be used?
A
When the brakes are hot.
B
When the air pressure is low.
C
When the temperature is below freezing.
D
When the combined weight of your truckload and vehicle exceeds five tons.
Question 22
The most common type of foundation brakes are ______ brakes.
A
shoe
B
s-cam drum
C
disc
D
wedge
Question 23
What does it mean when the safety valve releases air?
A
The air pressure has exceeded 150 psi.
B
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
C
All of these.
D
There is way too much air in the air compressor.
Question 24
What should you do when you see the low pressure warning?
A
Check your air pressure gauge and drive at highway speeds.
B
Pump the brake pedal hard until you come to a stop.
C
Safely bring the automobile to a stop while you still have control over the brakes.
D
Stay calm and wait for the air brakes to come on automatically.
Question 25
What is a good indication that your truck's single brake system needs to be adjusted?
A
When pressure increases from 85 to 100 psi within 45 seconds.
B
When the governor switch stops between 75 to 90 psi.
C
When pressure increases from 50 to 75 psi within three minutes.
D
When the compressor shuts off between 70 to 90 psi.
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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!