Iowa Air Brakes Practice Test

This is our Iowa 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!

Air Brakes CDL Practice Quiz

Please wait while the activity loads.
If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If loading fails, click here to try again

Start

Congratulations! You have completed the Air Brakes CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

The air storage tanks are used to hold ______.

A	compressed air
B	compressed gas
C	oxygen and helium
D	nitrogen and oxygen

Question 2

Brake drums are:

A	bolted securely to the wheels.
B	located on either end of the vehicle's axles.
C	used to hold the brake shoes and linings.
D	all of these.

Question 3

What two substances usually found in compressed air are harmful to the brake system?

A	Dust and compressor oil.
B	Water and compressor oil.
C	Compressed air does not contain any of these substances.
D	Dust and water.

Question 4

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 the governor switch stops between 75 to 90 psi.
C	When the compressor shuts off between 70 to 90 psi.
D	When pressure increases from 85 to 100 psi within 45 seconds.

Question 5

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 6

Compressed air is let out of the system by ______.

A	activating the parking brake
B	letting up on the brake pedal
C	activating the emergency brake
D	pushing down on the brake pedal

Question 7

The service brake system:

A	applies and releases the vehicle's brakes using the brake pedal.
B	is only on automobiles with hydraulic brakes.
C	is only found on automobiles with hydraulic brakes.
D	is known as an official vehicle inspection.

Question 8

Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.

A	remove fuel from the air lines
B	remove oil from the air lines
C	reduce the risk of ice in the air brake valves
D	evaporate any alcohol, which can damage the brake system

Question 9

Are front wheel brakes good under all conditions?

A	Only if they are disc brakes.
B	Yes.
C	No.
D	Only if they are drum brakes.

Question 10

In an air brake system, the air compressor pumps air into the ______.

A	brake system
B	air tank drains
C	hydraulic brakes
D	storage tanks

Question 11

The safety valve in the air compressor tank should open at ______ psi.

A	125
B	150
C	200
D	175

Question 12

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 parking brake system, service brake system, and emergency brake system.
D	The emergency brake system, parking brake system, and foundation brake system.

Question 13

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	None of these.
D	To let you know how much oxygen is in the air tanks.

Question 14

When should the air tanks be drained?

A	Before every trip.
B	Once a week.
C	Once a day.
D	Every 1,000 miles.

Question 15

The ______ forces the brake ______ away from each other and against the inside of the brake drum.

A	s-cam, shoes
B	pressure valve, boots
C	valve spring, shoes
D	coil, boots

Question 16

Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?

A	False
B	True

Question 17

Air tanks must be drained to:

A	prevent someone from moving the vehicle.
B	completely empty air out of the tank.
C	drain oil and moisture from the tank.
D	prevent them from freezing during cold temperatures.

Question 18

The device that protects the tank and the rest of the air brake system from too much pressure is known as the:

A	air tank drain.
B	application pressure gauge.
C	governor.
D	safety valve.

Question 19

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, parking brake systems
C	service brake, emergency brake systems
D	disc brake, emergency brake systems

Question 20

Spring brakes are ______.

A	springs that press the brakes on to stop the vehicle if the air brakes leak out
B	specialized brakes only to be used during warm weather
C	the spring that is attached to the brake pedal
D	used for parking

Question 21

What will happen if your air compressor stops working?

A	You will instantly lose braking power.
B	Your brakes will instantly lock up.
C	Nothing will happen.
D	You will still have some air pressure left in the air tanks.

Question 22

The most common type of foundation brakes are ______ brakes.

A	wedge
B	disc
C	s-cam drum
D	shoe

Question 23

When should the parking brake not be used?

A	When the brakes are hot.
B	When the temperature is below freezing.
C	When the air pressure is low.
D	When the combined weight of your truckload and vehicle exceeds five tons.

Question 24

In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.

A	two, sixty
B	one, thirty
C	one, sixty
D	three, sixty

Question 25

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	There is way too much air in the air compressor.
D	The air pressure has exceeded 150 psi.

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 25 questions to complete.

←

List

→

Return

Shaded items are complete.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
End

Return

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!

Air Brakes CDL Practice Test

Please wait while the activity loads.
If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If loading fails, click here to try again

Start

Congratulations! You have completed the Air Brakes CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.

A	one, thirty
B	two, sixty
C	one, sixty
D	three, sixty

Question 2

The service brake system:

A	is only found on automobiles with hydraulic brakes.
B	applies and releases the vehicle's brakes using the brake pedal.
C	is only on automobiles with hydraulic brakes.
D	is known as an official vehicle inspection.

Question 3

The supply pressure gauge is used for what purpose?

A	To let you know how much water is in the air tank.
B	None of these.
C	To let you know how much diesel fuel is in the vehicle.
D	To let you know how much oxygen is in the air tanks.

Question 4

In an air brake system, the air compressor pumps air into the ______.

A	storage tanks
B	hydraulic brakes
C	brake system
D	air tank drains

Question 5

The most common type of foundation brakes are ______ brakes.

A	disc
B	wedge
C	shoe
D	s-cam drum

Question 6

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	Stay calm and wait for the air brakes to come on automatically.
C	Pump the brake pedal hard until you come to a stop.
D	Check your air pressure gauge and drive at highway speeds.

Question 7

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 8

What will happen if your air compressor stops working?

A	Your brakes will instantly lock up.
B	You will still have some air pressure left in the air tanks.
C	You will instantly lose braking power.
D	Nothing will happen.

Question 9

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 emergency brake system, parking brake system, and foundation brake system.
D	The disc brake system, drum brake system, and foundation brake system.

Question 10

Spring brakes are ______.

A	specialized brakes only to be used during warm weather
B	springs that press the brakes on to stop the vehicle if the air brakes leak out
C	used for parking
D	the spring that is attached to the brake pedal

Question 11

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 12

Brake drums are:

A	located on either end of the vehicle's axles.
B	bolted securely to the wheels
C	all of these.
D	used to hold the brake shoes and linings.

Question 13

Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?

A	False
B	True

Question 14

When should the air tanks be drained?

A	Before every trip.
B	Once a day.
C	Every 1,000 miles.
D	Once a week.

Question 15

Air tanks must be drained to:

A	prevent them from freezing during cold temperatures.
B	prevent someone from moving the vehicle.
C	completely empty air out of the tank.
D	drain oil and moisture from the tank.

Question 16

What is a good indication that your automobile's single brake system needs to be adjusted?

A	When the compressor shuts off between 70 to 90 psi.
B	When pressure increases from 85 to 100 psi within 45 seconds.
C	When pressure increases from 50 to 75 psi within three minutes.
D	When the governor switch stops between 75 to 90 psi.

Question 17

When should the parking brake not be used?

A	When the temperature is below freezing.
B	When the combined weight of your truckload and vehicle exceeds five tons.
C	When the brakes are hot.
D	When the air pressure is low.

Question 18

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	safety valve.
C	air tank drain.
D	application pressure gauge.

Question 19

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 20

The ______ forces the brake ______ away from each other and against the inside of the brake drum.

A	valve spring, shoes
B	pressure valve, boots
C	coil, boots
D	s-cam, shoes

Question 21

The air storage tanks are used to hold ______.

A	nitrogen and oxygen
B	compressed air
C	oxygen and helium
D	compressed gas

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, parking brake systems
D	disc brake, emergency brake systems

Question 23

Are front wheel brakes good under all conditions?

A	No.
B	Yes.
C	Only if they are disc brakes.
D	Only if they are drum brakes.

Question 24

Compressed air is let out of the system by ______.

A	activating the parking brake
B	letting up on the brake pedal
C	activating the emergency brake
D	pushing down on the brake pedal

Question 25

The safety valve in the air compressor tank should open at ______ psi.

A	125
B	150
C	175
D	200

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 25 questions to complete.

←

List

→

Return

Shaded items are complete.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
End

Return

Back to Iowa CDL Practice Test

5/5 - (1 vote)