The time required for the brakes to work after the brake pedal is pressed

The distance between the brake pedal and the floor

The amount of air pressure used to stop the vehicle

Are helpful to remove water and oil from the air tanks.

Should not be used in cold weather.

Are used to move air to the brakes.

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

Q.1

Using an Anti-Lock Braking System (ABS):

Is required in some states.
Shortens brake response time.
Provides additional control.

Q.2

What is brake lag?

The time required for the brakes to work after the brake pedal is pressed
The distance between the brake pedal and the floor
The amount of air pressure used to stop the vehicle

Q.3

If using spring brakes when hauling a heavy load, a complete stop will:

Be impossible.
Take a long time.
Take a short amount of time.

Q.4

The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

8 psi
5 psi
3 psi

Q.5

When traveling down a steep downgrade:

The air brakes should be used.
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.

Q.6

Anti-Lock Braking Systems (ABS):

Reduce a vehicle's normal braking capacity.
Are in addition to other braking systems and do not reduce a vehicle's braking power.
Are not effective on larger vehicles.

Q.7

When stopping in an emergency situation, you should:

Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.

Q.8

A low air pressure warning signal:

Is not recommended on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.

Q.9

Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.

Q.10

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to the neutral position.

Q.11

When the spring brakes are on, you should never:

Turn on the lights.
Turn off the vehicle.
Push down the brake pedal.

Q.12

What color malfunction lamps do vehicles equipped with ABS have?

Green
Yellow
Blue

Q.13

Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

Stop the compressor from pumping air.
Release air from the tanks.
Begin pumping air into the tanks.

Q.14

When an S-cam turns inside a brake drum, the S-cam:

Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.

Q.15

When you are about to start down a hill, you should switch into a ____ gear.

Higher
Faster
Lower

Q.16

You must have an air brake endorsement:

To use a vehicle with air brakes.
To drive any truck with a trailer.
To transport hazardous materials.

Q.17

Alcohol evaporators are:

Illegal.
Used to add alcohol to braking systems to prevent items from freezing.
Only allowed on vehicles carrying hazardous materials.

Q.18

You should test the low pressure warning signal by:

Turning on the engine and applying the trailer hand brake.
Rapidly pressing and releasing the brake pedal.
Removing wheel chocks and disengaging the parking brake.

Q.19

A low air pressure warning signal:

Is not required on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.

Q.20

An alcohol evaporator is especially important:

In cold weather.
In hot weather.
In dry weather.

Q.21

During an applied leakage test, what is the maximum leakage rate that is safe for a single vehicle with air brakes?

10 psi in one minute
5 psi in one minute
3 psi in one minute

Q.22

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.23

Friction in an S-cam brake is caused when the brake shoes and linings:

Press against the outside of the brake drum.
Press against the inside of the brake drum.
Push against each other.

Q.24

What kind of force do emergency brakes use?

Air pressure
Mechanical
Heavy

Q.25

Air tank drains:

Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.

Using an Anti-Lock Braking System (ABS):

What is brake lag?

If using spring brakes when hauling a heavy load, a complete stop will:

The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

When traveling down a steep downgrade:

Anti-Lock Braking Systems (ABS):

When stopping in an emergency situation, you should:

A low air pressure warning signal:

Why do large vehicles use air brakes?

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

When the spring brakes are on, you should never:

What color malfunction lamps do vehicles equipped with ABS have?

Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

When an S-cam turns inside a brake drum, the S-cam:

When you are about to start down a hill, you should switch into a ____ gear.

You must have an air brake endorsement:

Alcohol evaporators are:

You should test the low pressure warning signal by:

A low air pressure warning signal:

An alcohol evaporator is especially important:

During an applied leakage test, what is the maximum leakage rate that is safe for a single vehicle with air brakes?

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

Friction in an S-cam brake is caused when the brake shoes and linings:

What kind of force do emergency brakes use?

Air tank drains:

0 h : 0 m : 1 s

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