Are used to drain water and compressor oil from the air tank.

Allow rain water to enter the tank.

Must remain open during transit.

Prevent the air compressor from overheating

Prevent the front brakes from being used on ice

Prevent the brakes from being used if downshifting would be more effective

Colorado CDL Air Brakes 1 - DMV Written Test Questions with Answers

Q.1

While driving, spring brakes are generally held in place by:

Air pressure.
Chocks.
Foundation brakes.
Sturdy ties.

Q.2

If using air tanks with manually operated drains, how often should you drain the tanks?

Every day
Once a week
Once a month
Once every 3,000 miles

Q.3

Air tank drains:

Allow rain water to enter the tank.
Are used to drain water and compressor oil from the air tank.
Should never be opened.
Must remain open during transit.

Q.4

Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

Q.5

What color are ABS malfunction lamps?

Orange
Yellow
Green
Blue

Q.6

A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.

Green
Yellow
Orange
White

Q.7

When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.

At least three inches
More than two inches
Up to five inches
No more than one inch

Q.8

During a static leakage test, the maximum leakage rate for a triple combination vehicle with air brakes is ____ in a minute.

3 psi
5 psi
7 psi
9 psi

Q.9

Applying the brake pedal causes air pressure to activate an electric switch and:

Turn off the brake lights.
Turn on the low pressure warning light.
Turn on the brake lights.
Turn off the low pressure warning light.

Q.10

Braking mechanisms are located ____ a brake drum.

Outside
Inside
Next to
On top of

Q.11

Both systems in a dual air brake systems share:

Air tanks.
Hoses.
Air lines.
An air compressor.

Q.12

How should you test the low pressure warning signal?

Engage and disable the parking brake.
Rapidly press and release the brake pedal.
Open the rear shut-off valves.
Uncouple and recouple all glad hands.

Q.13

What happens if the air pressure in a system's air tanks falls below 60 psi?

A warning light will come on.
The vehicle will not shift out of gear.
The front lights will flash.
The vehicle should stop.

Q.14

When you need to stop in an emergency, you should:

Lock the wheels and skid to a stop.
Stop in a way that keeps your vehicle in a straight line.
Stop in a way that turns your vehicle.
Expect your vehicle to slow down more quickly than usual.

Q.15

The air compressor governor controls:

When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of air pumped into the air storage tanks.
The speed of the vehicle.

Q.16

How many air storage tanks are used in an air brake system?

Two tanks
Four tanks
Six tanks
The number varies.

Q.17

What does ABS do?

Prevent wheel lockup
Prevent the air compressor from overheating
Prevent the front brakes from being used on ice
Prevent the brakes from being used if downshifting would be more effective

Q.18

Brakes may get out of adjustment:

If they are too hot.
In colder weather.
If they are used.
If they get wet.

Q.19

When using the controlled braking method in an emergency situation, you should:

Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half of your usual force.
Apply the brakes so the wheels lock.
Apply the brakes with minimal pressure.

Q.20

Which type of brakes do most heavy-duty vehicles have?

Air brakes
Solid brakes
Liquid brakes
Gravity brakes

Q.21

The emergency brake system uses:

Only parts of the parking brake system.
Only parts of the service brake system.
Parts of both the parking and service brake systems.
Only parts unique to the emergency brake system.

Q.22

The air storage tanks:

Hold only enough air for one braking cycle.
Hold enough air for brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
Hold enough air for more than 1,000 braking cycles.

Q.23

The application pressure gauge:

Shows how much air pressure is being applied to the brakes.
Shows the temperature of air being used in the braking system.
Shows the pressure of the air coming from the compressor.
Shows the number of times the brakes have been used.

Q.24

When only the tractor is equipped with an Anti-Lock Braking System (ABS):

There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.

Q.25

When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Slack adjuster.
Axle.
Brake drum.
Alcohol evaporator.