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DMV PRACTICE
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Florida CDL Air Brakes Test 2
Practice mode
Question
1
of 25
QUESTION 1 / 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.
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C
Call the local law enforcement agency.
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D
Safely exit the roadway and stop.
✓
QUESTION 2 / 25
If the spring brakes are activated, you should never:
Choose one answer below.
A
Push down the brake pedal.
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B
Open the hood.
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C
Release air from the air storage tanks.
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D
Open the door to the cab.
✓
QUESTION 3 / 25
Most heavy-duty vehicles use:
Choose one answer below.
A
Single air brake systems.
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B
Dual air brake systems.
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C
Triple air brake systems.
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D
Quadruple air brake systems.
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QUESTION 4 / 25
A low air pressure warning signal should activate:
Choose one answer below.
A
When tank pressure falls below 120 psi.
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B
When tank pressure falls below 60 psi.
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C
When tank pressure falls below 10 psi.
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D
When tank pressure falls below 5 psi.
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QUESTION 5 / 25
Emergency brakes:
Choose one answer below.
A
Are not required on trucks.
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B
Are only required on trailers.
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C
Are required on tractors.
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D
Are optional.
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QUESTION 6 / 25
If using air tanks with manually operated drains, how often should you drain the tanks?
Choose one answer below.
A
Every day
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B
Once a week
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C
Once a month
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D
Once every 3,000 miles
✓
QUESTION 7 / 25
During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
Choose one answer below.
A
10 psi in a minute.
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B
8 psi in a minute.
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C
6 psi in a minute.
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D
4 psi in a minute.
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QUESTION 8 / 25
The air pressure in a dual air brake system should build from 85 to 100 psi within:
Choose one answer below.
A
Two minutes.
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B
15 seconds.
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C
10 minutes.
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D
45 seconds.
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QUESTION 9 / 25
The service brake system:
Choose one answer below.
A
Applies and releases the brakes when you press the brake pedal while driving normally.
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B
Applies and releases the parking brakes.
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C
Applies and releases the emergency brake.
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D
Applies and releases the axle brake.
✓
QUESTION 10 / 25
Air tank drains:
Choose one answer below.
A
Allow rain water to enter the tank.
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B
Are used to drain water and compressor oil from the air tank.
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C
Should never be opened.
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D
Must remain open during transit.
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QUESTION 11 / 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.
✓
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.
✓
D
The brakes will become more sensitive.
✓
QUESTION 12 / 25
What color is the low air pressure warning light?
Choose one answer below.
A
Green
✓
B
Orange
✓
C
Red
✓
D
Purple
✓
QUESTION 13 / 25
The most common type of foundation brake used is the:
Choose one answer below.
A
S-cam drum brake.
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B
C-cam drum brake.
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C
G-cam disc brake.
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D
P-cam disc brake.
✓
QUESTION 14 / 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 15 / 25
When operating a vehicle with a dual brake system, a driver should:
Choose one answer below.
A
Let the vehicle warm up before driving to ensure that fuel reaches the engine.
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B
Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.
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C
Begin driving just after the vehicle starts.
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D
Pump the pedal about 20 times to build pressure, then begin driving.
✓
QUESTION 16 / 25
In cold weather, an alcohol evaporator should be checked and filled:
Choose one answer below.
A
Once a week.
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B
Every day.
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C
Every hour.
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D
Once a month.
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QUESTION 17 / 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.
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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.
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QUESTION 18 / 25
What is a wig wag?
Choose one answer below.
A
A type of warning system
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B
A tube used to move air from the compressor to the tanks
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C
A noise made by air brakes when used
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D
A part within the braking unit that allows air to move freely
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QUESTION 19 / 25
The air storage tanks:
Choose one answer below.
A
Hold only enough air for one braking cycle.
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B
Hold enough air for brakes to be used several times if the compressor stops working.
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C
Do not hold air unless there is an emergency.
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D
Hold enough air for more than 1,000 braking cycles.
✓
QUESTION 20 / 25
If the brake pads rub against the brake drums and create too much heat:
Choose one answer below.
A
The brakes will stick.
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B
The brakes will become extra sensitive.
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C
The brakes may stop working.
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D
The air compressor will kick on to cool the brakes.
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QUESTION 21 / 25
To stop in a vehicle that uses air brakes, the driver should:
Choose one answer below.
A
Pull the air brake lever.
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B
Engage the brake lever.
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C
Push the brake pedal down.
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D
Pull the brake pedal up.
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QUESTION 22 / 25
A dual air brake system:
Choose one answer below.
A
Has a single air brake system, but uses two sets of controls.
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B
Has one air brake system for each side of the truck.
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C
Has two brakes for each wheel.
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D
Has two separate air brake systems, but uses a single set of controls.
✓
QUESTION 23 / 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
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D
100 psi
✓
QUESTION 24 / 25
Pressing and releasing a brake pedal unnecessarily can:
Choose one answer below.
A
Release air faster than it can be replaced.
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B
Add more air to the braking system.
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C
Make the brake pedal more sensitive.
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D
Create a loud noise.
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QUESTION 25 / 25
Which of the following is not a part of an air brake system?
Choose one answer below.
A
A service brake system
✓
B
A parking brake system
✓
C
An emergency brake system
✓
D
An axle brake system
✓
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