Are not required on vehicles with air brakes.

A tube that carries air to the brakes.

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

Nevada CDL Air Brakes 2 - DMV Written Test Questions with Answers

Q.1

If the air pressure warning light comes on, you should:

Continue to drive normally.
Drive with one foot on the accelerator and one foot on the brake pedal.
Call the local law enforcement agency.
Safely exit the roadway and stop.

Q.2

Air pressure should build up in a single air system within:

15 minutes.
12 minutes.
Three minutes.
One minute.

Q.3

Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.

Q.4

If you are driving and the ABS light comes on, it means that the ABS:

Cannot work due to weather conditions.
Has just been activated.
Is not working properly.

Q.5

On a truck with air brakes, the braking system’s air compressor:

Pumps air into the air storage tanks.
Fills the tires.
Moves air to the back of the truck.
Cleans the brakes.

Q.6

Some air brake systems introduce alcohol into the system to:

Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.

Q.7

To use the controlled braking method, you should:

Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half-force.
Apply the brakes until the wheels lock.
Pump the brakes.

Q.8

In a vehicle with dual air brakes, a leak in one system ____ the second system.

Will always affect
May not affect
Is caused by

Q.9

Air tank drains should:

Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.

Q.10

A safety valve is set to open at ____ pounds per square inch (psi).

Q.11

Emergency brakes:

Are not required on vehicles with air brakes.
Are required only on buses.
Are required on all vehicles.

Q.12

In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.

Q.13

The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.

Slack adjuster
One-way check valve
Tractor protection valve

Q.14

In cold weather, an alcohol evaporator should be checked and filled:

Once a week.
Every day.
Every hour.
Once a month.

Q.15

In a vehicle with dual parking control valves, a separate air tank can be used:

To make the air brakes work more effectively.
To temporarily release the spring brakes.
To charge the brakes on the rear trailer.

Q.16

A wig wag is:

A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.

Q.17

If one air system in a dual air brake system is very low on pressure:

None of the brakes will work at all.
Either the front or rear brakes will not be operating fully.
There will be no noticeable affect.
Lights on the outside of the tractor will flash.

Q.18

On trucks and buses, where are ABS malfunction lamps located?

On the driver’s door
On the instrument panel
On the outside of the vehicle by the passenger’s door
Under the hood

Q.19

Air pressure should build up in a single air system within:

15 minutes.
12 minutes.
Three minutes.

Q.20

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.

32 feet
15 feet
50 feet
10 feet

Q.21

The air storage tanks:

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

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

Brakes may get out of adjustment:

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

Q.24

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.25

Most heavy-duty vehicles use:

Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.

If the air pressure warning light comes on, you should:

Air pressure should build up in a single air system within:

Failing to drain air tanks could result in:

If you are driving and the ABS light comes on, it means that the ABS:

On a truck with air brakes, the braking system’s air compressor:

Some air brake systems introduce alcohol into the system to:

To use the controlled braking method, you should:

In a vehicle with dual air brakes, a leak in one system ____ the second system.

Air tank drains should:

A safety valve is set to open at ____ pounds per square inch (psi).

Emergency brakes:

In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.

In cold weather, an alcohol evaporator should be checked and filled:

In a vehicle with dual parking control valves, a separate air tank can be used:

A wig wag is:

If one air system in a dual air brake system is very low on pressure:

On trucks and buses, where are ABS malfunction lamps located?

Air pressure should build up in a single air system within:

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.

The air storage tanks:

The air storage tanks:

Brakes may get out of adjustment:

What does ABS do?

Most heavy-duty vehicles use:

0 h : 0 m : 1 s

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