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Indiana CDL Air Brakes Test 1
Practice mode
Question
1
of 25
QUESTION 1 / 25
If the spring brakes are activated, you should never:
Choose one answer below.
A
Push down the brake pedal.
✓
B
Open the hood.
✓
C
Release air from the air storage tanks.
✓
D
Open the door to the cab.
✓
QUESTION 2 / 25
If the spring brakes are on, you should:
Choose one answer below.
A
Not use the brake pedal.
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B
Press the accelerator.
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C
Move the steering wheel.
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D
Be especially careful because the brakes may fail.
✓
QUESTION 3 / 25
When only the tractor is equipped with an Anti-Lock Braking System (ABS):
Choose one answer below.
A
There is a decreased risk of jackknifing.
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B
There is an increased risk of jackknifing.
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C
The brakes will not work as effectively as they would without ABS.
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D
The brakes will become more sensitive.
✓
QUESTION 4 / 25
In a dual air brake system, a leak in one system:
Choose one answer below.
A
Always means there are leaks in both systems.
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B
May not affect the other system.
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C
Is not something to worry about.
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D
Will also affect the other system.
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QUESTION 5 / 25
How is the parking brake released?
Choose one answer below.
A
By tapping the brake pedal three times
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B
By pushing in the brake control knob
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C
By starting the vehicle
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D
By tapping the accelerator twice
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QUESTION 6 / 25
In a dual air brake system:
Choose one answer below.
A
Each system has separate air tanks, hoses, and lines.
✓
B
The systems share air tanks, but each has its own separate hoses and lines.
✓
C
Each system uses the same lines and hoses.
✓
D
One system is the main braking system and a second system is ready to be used if the first one fails.
✓
QUESTION 7 / 25
If the air pressure warning light comes on, you should:
Choose one answer below.
A
Continue driving normally.
✓
B
Activate your hazard lights and continue driving.
✓
C
Call the local law enforcement agency.
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D
Safely exit the roadway and stop.
✓
QUESTION 8 / 25
How many air storage tanks are used in an air brake system?
Choose one answer below.
A
Two tanks
✓
B
Four tanks
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C
Six tanks
✓
D
The number varies.
✓
QUESTION 9 / 25
Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
Choose one answer below.
A
25 psi
✓
B
50 psi
✓
C
75 psi
✓
D
100 psi
✓
QUESTION 10 / 25
In cold weather, an alcohol evaporator should be checked and filled:
Choose one answer below.
A
Once a week.
✓
B
Every day.
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C
Every hour.
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D
Once a month.
✓
QUESTION 11 / 25
Brake fading is caused when:
Choose one answer below.
A
Brakes are not used often enough.
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B
Brakes overheat.
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C
Brakes are too cold.
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D
Brakes are wet.
✓
QUESTION 12 / 25
To confirm that a trailer has ABS, you can:
Choose one answer below.
A
Look under the trailer for wheel speed sensors coming from the back of the brakes.
✓
B
Look under the hood for the ABS sticker.
✓
C
Look at the tires.
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D
Remove a tire and look for the ABS sensor on the axle.
✓
QUESTION 13 / 25
While driving, spring brakes are generally held in place by:
Choose one answer below.
A
Air pressure.
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B
Chocks.
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C
Foundation brakes.
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D
Sturdy ties.
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QUESTION 14 / 25
The parking brake should be:
Choose one answer below.
A
Used whenever you park the vehicle.
✓
B
Used while driving.
✓
C
Set when driving in bad weather.
✓
D
Used to stop the vehicle in normal driving.
✓
QUESTION 15 / 25
An Anti-Lock Braking System (ABS):
Choose one answer below.
A
Cannot be used with air brakes.
✓
B
Should be used on dry pavement.
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C
Can assist in maintaining control when braking.
✓
D
Should only be used if all axles have ABS.
✓
QUESTION 16 / 25
Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:
Choose one answer below.
A
Are necessary for the proper function of the air brake system.
✓
B
Should be added if low.
✓
C
Should be removed regularly.
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D
Are not concerns.
✓
QUESTION 17 / 25
During a static leakage test, the maximum leakage rate for a double combination vehicle is:
Choose one answer below.
A
3 psi in one minute.
✓
B
6 psi in one minute.
✓
C
8 psi in one minute.
✓
D
4 psi in one minute.
✓
QUESTION 18 / 25
To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Choose one answer below.
A
Set the control to normal.
✓
B
Set the control to the off position.
✓
C
Set the control to neutral.
✓
D
Keep the control at the halfway mark.
✓
QUESTION 19 / 25
What can happen if the air pressure gets too low in an air brake system?
Choose one answer below.
A
The brakes may squeak.
✓
B
The brakes may not work.
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C
The brakes may be sluggish.
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D
The brakes will be very sensitive.
✓
QUESTION 20 / 25
What is brake lag?
Choose one answer below.
A
The time required for the brakes to work after the brake pedal is pushed
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B
The distance between the brake pedal’s resting position and the floor
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C
The amount of air pressure used to stop a vehicle
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D
How faded the brakes are
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QUESTION 21 / 25
If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.
Choose one answer below.
A
32 feet
✓
B
15 feet
✓
C
50 feet
✓
D
10 feet
✓
QUESTION 22 / 25
During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:
Choose one answer below.
A
3 psi in one minute.
✓
B
6 psi in one minute.
✓
C
8 psi in one minute.
✓
D
4 psi in one minute.
✓
QUESTION 23 / 25
Applying the brake pedal causes air pressure to activate an electric switch and:
Choose one answer below.
A
Turn off the brake lights.
✓
B
Turn on the low pressure warning light.
✓
C
Turn on the brake lights.
✓
D
Turn off the low pressure warning light.
✓
QUESTION 24 / 25
What color is the low air pressure warning light?
Choose one answer below.
A
Green
✓
B
Orange
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C
Red
✓
D
Purple
✓
QUESTION 25 / 25
Friction inside a brake drum is caused when the brake shoes and linings:
Choose one answer below.
A
Push against each other.
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B
Separate from the axle.
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C
Push against the inside of the drum.
✓
D
Create excess heat.
✓
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