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Arizona Air Brakes CDL Practice Test
Practice mode
Question
1
of 25
QUESTION 1 / 25
What aspect of driving could be affected by a malfunctioning air compressor governor?
Choose one answer below.
A
Steering responsiveness
✓
B
Braking performance
✓
C
Pedal sensitivity
✓
D
Wheel alignment
✓
QUESTION 2 / 25
How does cold weather impact air brakes?
Choose one answer below.
A
It improves braking performance
✓
B
It has no impact on air brakes
✓
C
It can cause moisture in air lines to freeze
✓
D
It reduces the efficiency of the air compressor
✓
QUESTION 3 / 25
During cold weather, what should you do daily if your vehicle has an alcohol evaporator?
Choose one answer below.
A
Clean the air filter with alcohol
✓
B
Check and fill the alcohol level
✓
C
Change the alcohol from a new bottle
✓
D
Check the oil for alcohol content
✓
QUESTION 4 / 25
How often should air tanks be drained?
Choose one answer below.
A
Once a week
✓
B
Once a day
✓
C
Every four hours
✓
D
Every two or three days
✓
QUESTION 5 / 25
What warning level must be seen before the air pressure in the service air tanks falls below?
Choose one answer below.
A
80 psi
✓
B
40 psi
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C
20 psi
✓
D
60 psi
✓
QUESTION 6 / 25
How can a driver reduce the chances of brake fade on long declines?
Choose one answer below.
A
Using brakes intermittently
✓
B
Driving in a lower gear
✓
C
Keeping the vehicle in neutral
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D
Accelerating before descending
✓
QUESTION 7 / 25
How does a driver engage the parking brake?
Choose one answer below.
A
By pressing the brake pedal harder
✓
B
By pulling a lever or pressing a button
✓
C
By turning a knob
✓
D
By pulling the emergency brake
✓
QUESTION 8 / 25
What is a required feature for all vehicles equipped with air brakes?
Choose one answer below.
A
low pressure warning signal
✓
B
red light only
✓
C
mechanical arm only
✓
D
Only a buzzer
✓
QUESTION 9 / 25
When should air tanks be drained?
Choose one answer below.
A
At the end of each day or shift
✓
B
To keep sludge from clogging brake system valves
✓
C
When automatic devices fail
✓
D
All of the above
✓
QUESTION 10 / 25
What is the third system combined in modern air brake systems, alongside the service brakes and parking brakes?
Choose one answer below.
A
S-cam brakes.
✓
B
Drum brakes.
✓
C
Foot brakes.
✓
D
Emergency brakes.
✓
QUESTION 11 / 25
What characterizes a dual air brake system?
Choose one answer below.
A
single air supply for all brakes
✓
B
Separate air supply for the front and rear brakes
✓
C
vacuum-based brake operation
✓
D
system that only works in good weather
✓
QUESTION 12 / 25
How does loading affect the performance of air brakes?
Choose one answer below.
A
It has no effect on performance
✓
B
It can affect both braking distance and efficiency
✓
C
It improves braking efficiency
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D
It decreases the stopping power
✓
QUESTION 13 / 25
How often should air brake components be inspected for wear?
Choose one answer below.
A
Once a year
✓
B
Every few months
✓
C
Regularly, at every scheduled maintenance interval
✓
D
Only when there is a noticeable issue
✓
QUESTION 14 / 25
How often should an air filter in an air brake system be replaced?
Choose one answer below.
A
Once a week
✓
B
After every long trip
✓
C
According to the manufacturer's recommendations
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D
Only when visible damage occurs
✓
QUESTION 15 / 25
What feature prevents the trailer brakes from locking up during a sharp turn?
Choose one answer below.
A
The trailer control valve
✓
B
The anti-lock braking system
✓
C
The emergency brake
✓
D
The brake adjustment mechanism
✓
QUESTION 16 / 25
What should a driver do to ensure they can stop quickly in an emergency?
Choose one answer below.
A
Maintain a safe following distance
✓
B
Drive at a higher speed
✓
C
Apply brakes at the last moment
✓
D
Use the engine for braking
✓
QUESTION 17 / 25
What should be checked if the brake system shows excessive wear?
Choose one answer below.
A
Fuel levels
✓
B
Air filter condition
✓
C
Brake shoe condition
✓
D
Transmission fluid
✓
QUESTION 18 / 25
What should you inspect if the air pressure drops significantly?
Choose one answer below.
A
The engine oil levels
✓
B
The air brake system for leaks
✓
C
The fuel levels
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D
The tire pressure
✓
QUESTION 19 / 25
How often should air tanks be drained of moisture?
Choose one answer below.
A
Once a week
✓
B
Daily or as recommended by the manufacturer
✓
C
Before every trip
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D
Monthly
✓
QUESTION 20 / 25
To check the air compressor governor "cut in" and "cut out" pressures...
Choose one answer below.
A
Run the engine at a fast idle
✓
B
Step on and off the brake to reduce tank pressure
✓
C
Monitor the air pressure gauge
✓
D
All of the above
✓
QUESTION 21 / 25
In a single vehicle with a fully charged air system, what is the maximum acceptable air pressure loss after a brake is applied?
Choose one answer below.
A
2 psi per minute
✓
B
3 psi per minute
✓
C
4 psi per minute
✓
D
None of the above
✓
QUESTION 22 / 25
What is a crucial requirement for brake drums or discs?
Choose one answer below.
A
Must have linings that fit loosely
✓
B
Must not have any cracks
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C
Must not have cracks longer than half the width of the friction area
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D
Should be replaced every year
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QUESTION 23 / 25
What condition affects the braking power of the spring brakes?
Choose one answer below.
A
Can only be tested by highly trained brake service people.
✓
B
Depends on the adjustment of the service brakes.
✓
C
Increases when the service brakes are hot.
✓
D
Is not affected by the condition of the service brakes.
✓
QUESTION 24 / 25
If the air compressor develops a leak, what component keeps the air in the tanks?
Choose one answer below.
A
The tractor protection valve
✓
B
The emergency relay valve
✓
C
The one way check valve
✓
D
The air compressor
✓
QUESTION 25 / 25
What should you do to cool down hot brakes on a long descent?
Choose one answer below.
A
Use air pressure to cool them down
✓
B
Apply them frequently to maintain control
✓
C
Let them cool by avoiding constant pressure
✓
D
Stop completely to allow for cooling
✓
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