E
.
Learndmv
DMV PRACTICE
Toggle navigation
Find your state
Exam types
Practice tests
Sign in
Create account
↗
← Leave quiz
Colorado CDL Air Brakes Test 1
Practice mode
Question
1
of 25
QUESTION 1 / 25
While driving, spring brakes are generally held in place by:
Choose one answer below.
A
Air pressure.
✓
B
Chocks.
✓
C
Foundation brakes.
✓
D
Sturdy ties.
✓
QUESTION 2 / 25
If using air tanks with manually operated drains, how often should you drain the tanks?
Choose one answer below.
A
Every day
✓
B
Once a week
✓
C
Once a month
✓
D
Once every 3,000 miles
✓
QUESTION 3 / 25
Air tank drains:
Choose one answer below.
A
Allow rain water to enter the tank.
✓
B
Are used to drain water and compressor oil from the air tank.
✓
C
Should never be opened.
✓
D
Must remain open during transit.
✓
QUESTION 4 / 25
Emergency brakes:
Choose one answer below.
A
Are not required on trucks.
✓
B
Are only required on trailers.
✓
C
Are required on tractors.
✓
D
Are optional.
✓
QUESTION 5 / 25
What color are ABS malfunction lamps?
Choose one answer below.
A
Orange
✓
B
Yellow
✓
C
Green
✓
D
Blue
✓
QUESTION 6 / 25
A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.
Choose one answer below.
A
Green
✓
B
Yellow
✓
C
Orange
✓
D
White
✓
QUESTION 7 / 25
When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.
Choose one answer below.
A
At least three inches
✓
B
More than two inches
✓
C
Up to five inches
✓
D
No more than one inch
✓
QUESTION 8 / 25
During a static leakage test, the maximum leakage rate for a triple combination vehicle with air brakes is ____ in a minute.
Choose one answer below.
A
3 psi
✓
B
5 psi
✓
C
7 psi
✓
D
9 psi
✓
QUESTION 9 / 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 10 / 25
Braking mechanisms are located ____ a brake drum.
Choose one answer below.
A
Outside
✓
B
Inside
✓
C
Next to
✓
D
On top of
✓
QUESTION 11 / 25
Both systems in a dual air brake systems share:
Choose one answer below.
A
Air tanks.
✓
B
Hoses.
✓
C
Air lines.
✓
D
An air compressor.
✓
QUESTION 12 / 25
How should you test the low pressure warning signal?
Choose one answer below.
A
Engage and disable the parking brake.
✓
B
Rapidly press and release the brake pedal.
✓
C
Open the rear shut-off valves.
✓
D
Uncouple and recouple all glad hands.
✓
QUESTION 13 / 25
What happens if the air pressure in a system's air tanks falls below 60 psi?
Choose one answer below.
A
A warning light will come on.
✓
B
The vehicle will not shift out of gear.
✓
C
The front lights will flash.
✓
D
The vehicle should stop.
✓
QUESTION 14 / 25
When you need to stop in an emergency, you should:
Choose one answer below.
A
Lock the wheels and skid to a stop.
✓
B
Stop in a way that keeps your vehicle in a straight line.
✓
C
Stop in a way that turns your vehicle.
✓
D
Expect your vehicle to slow down more quickly than usual.
✓
QUESTION 15 / 25
The air compressor governor controls:
Choose one answer below.
A
When the air compressor pumps air into the air storage tanks.
✓
B
How fast air is pumped into the air storage tanks.
✓
C
The temperature of air pumped into the air storage tanks.
✓
D
The speed of the vehicle.
✓
QUESTION 16 / 25
How many air storage tanks are used in an air brake system?
Choose one answer below.
A
Two tanks
✓
B
Four tanks
✓
C
Six tanks
✓
D
The number varies.
✓
QUESTION 17 / 25
What does ABS do?
Choose one answer below.
A
Prevent wheel lockup
✓
B
Prevent the air compressor from overheating
✓
C
Prevent the front brakes from being used on ice
✓
D
Prevent the brakes from being used if downshifting would be more effective
✓
QUESTION 18 / 25
Brakes may get out of adjustment:
Choose one answer below.
A
If they are too hot.
✓
B
In colder weather.
✓
C
If they are used.
✓
D
If they get wet.
✓
QUESTION 19 / 25
When using the controlled braking method in an emergency situation, you should:
Choose one answer below.
A
Apply the brakes as hard as possible without locking the wheels.
✓
B
Apply the brakes with about half of your usual force.
✓
C
Apply the brakes so the wheels lock.
✓
D
Apply the brakes with minimal pressure.
✓
QUESTION 20 / 25
Which type of brakes do most heavy-duty vehicles have?
Choose one answer below.
A
Air brakes
✓
B
Solid brakes
✓
C
Liquid brakes
✓
D
Gravity brakes
✓
QUESTION 21 / 25
The emergency brake system uses:
Choose one answer below.
A
Only parts of the parking brake system.
✓
B
Only parts of the service brake system.
✓
C
Parts of both the parking and service brake systems.
✓
D
Only parts unique to the emergency brake system.
✓
QUESTION 22 / 25
The air storage tanks:
Choose one answer below.
A
Hold only enough air for one braking cycle.
✓
B
Hold enough air for brakes to be used several times if the compressor stops working.
✓
C
Do not hold air unless there is an emergency.
✓
D
Hold enough air for more than 1,000 braking cycles.
✓
QUESTION 23 / 25
The application pressure gauge:
Choose one answer below.
A
Shows how much air pressure is being applied to the brakes.
✓
B
Shows the temperature of air being used in the braking system.
✓
C
Shows the pressure of the air coming from the compressor.
✓
D
Shows the number of times the brakes have been used.
✓
QUESTION 24 / 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.
✓
C
The brakes will not work as effectively as they would without ABS.
✓
D
The brakes will become more sensitive.
✓
QUESTION 25 / 25
When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
Choose one answer below.
A
Slack adjuster.
✓
B
Axle.
✓
C
Brake drum.
✓
D
Alcohol evaporator.
✓
← Previous
0 of 25 answered
Next question →
Finish & see results →