AIR BRAKE CDL TEST – 03

We know that taking the air brakes test as part of your CDL permit can cause anxiety in even the most confident driver. That is why we designed this free air brake CDL test so that you can practice and get an idea of what types of questions will be asked on the actual test at the DMV.

Air Brake Test 03

1 / 25

Braking with air brakes from a 55 mph on dry pavement will add how much to your total stopping distance compared to hydraulic brakes?

32 feet

15 feet

42 feet

25 feet

2 / 25

To reach a speed 5 mph below your 'safe' speed on a downgrade should take around...?

Five seconds

Three seconds

Two seconds

Four seconds

3 / 25

The first maneuver in 'stab braking' is to...?

Apply the brakes 80%

Release the brakes immediately

Apply the brakes half way

Apply the brakes all the way

4 / 25

While making a controlled braking stop, your steering adjustments should be...?

The same as normal

Very small

Any of these depending on circumstances

Very large

5 / 25

Your brakes will overheat and start to fade if...?

You use them too much

It is a hot day

You are going downhill

You have been driving a long distance

6 / 25

If you only have ABS on your trailer and you start to lose control of the tractor steering, you should...?

Keep the brake pressure constant

Fan the brakes

Increase brake pressure

Let the brakes out

7 / 25

If your ABS malfunctions, you should...?

Drive slower than normal

Stop immediately

Drive normally and get it checked soon

Get it checked at the next garage

8 / 25

For a normal stop with air brakes, you should...?

Apply the brake pedal and the parking brake

Apply the parking brake

Fan the brake pedal

Push the brake pedal down

9 / 25

You should test the compressor governor cut in and cut out pressures with the engine running at...?

A medium idle

A slow idle

A fast idle

Close to stalling

10 / 25

ABS brakes will help you to...?

Do all these things

Brake in a shorter space of time

Brake in a shorter distance

Steer around an object while braking

11 / 25

If your brakes are very hot from a long downgrade, you should avoid...?

Using the parking brake

Descending for the rest of the day

Trying to take curves

Using them to stop

12 / 25

Braking at 15 mph on dry pavement, you will take how much further to stop with air brakes than you would with hydraulic brakes?

6 feet

15 feet

12 feet

9 feet

13 / 25

When you have chosen a 'safe' speed for descending, you should try to keep your speed between it and...?

10 mph slower

5 mph faster

10 mph faster

5 mph slower

14 / 25

If your brakes are very hot, or are wet when the temperature is freezing, instead of using the parking brake you should...?

Wedge the foot pedal

Leave the vehicle unbraked on flat ground

Park at the bottom of a dip

Chock the wheels

15 / 25

Front wheel braking is good under all conditions.

TRUE

FALSE

16 / 25

When braking on downgrades...?

Go slow enough so that a light, steady use of the brakes keeps you from speeding up

Repeatedly press and release the pedal

Speed up

aaa

17 / 25

If the air compressor develops a leak, what keeps the air in the tanks?

S-cam drum

The one-way check valve

Alcohol Evaporator

Air compressor governor

18 / 25

If your wheels lock up, you must be aware that after you release the brakes it can take up to how long for the wheels to start rolling again?

0.25 of a second

0.75 of a second

0.5 of a second

One second

19 / 25

Which of these is the most important factor in descending a downgrade safely?

Emergency brakes

Service brakes

They are all equally important

Engine braking

20 / 25

You are driving a vehicle at 55 mph on dry pavement under good traction conditions. What is the approximate total stopping distance needed to bring your vehicle to a complete stop?

100 feet

30 meters

Just over the length of a football field

10 meters

21 / 25

When braking with a manual transmission, you should not press the clutch in until the engine RPM is...?

Around 50%

Close to idle

Around 35%

Around 60%

22 / 25

Repeatedly pressing and releasing (FANNING) the pedal may result in a loss of air pressure.

TRUE

FALSE

23 / 25

If you only have ABS on your tractor and your trailer starts to swing out, you should...?

Increase brake pressure

Fan the brakes

Let the brakes out

Keep the brake pressure constant

24 / 25

To test the parking brake, you should apply it and...?

Push the vehicle from in front

Push the vehicle from behind

Accelerate hard

Gently try to pull forward

25 / 25

Which of these is a factor in braking with air brakes which does not apply to hydraulic brakes?

Braking distance

Perception distance

Brake lag distance

Reaction distance

Your score is

Taking the air brakes test as part of your CDL permit can be a source of anxiety, even for experienced drivers. To assist you in your preparation, we have created a free air brake CDL practice test that mirrors the types of questions you may encounter on the actual DMV test. We encourage you to utilize this resource repeatedly until you feel confident in achieving a perfect score.

This practice test is designed to enhance your understanding of the material and improve your skills as you study for your exam. We invite you to return and explore all of our practice exams to support your preparation further.

Additionally, by engaging with these tailored CDL Air Brake test questions, you will not only build your confidence but also gain essential knowledge for a successful career in driving.