CDL PRACTICE TEST AIR BRAKES – 04

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 cdl practice test air brakes so that you can practice and get an idea of what types of questions will be asked on the actual test at the DMV. We encourage you to take it as many times as you would like or until you get a perfect score. We hope that this practice test proves helpful as you study for your exam. Please visit us again and take all of our practice exams as often as you would like.

Air Brake Test 04

1 / 25

Spring brakes...?

Are held by mechanical force

Are held by brake drum

Are held by S-cam drum

Are held by safety valve

2 / 25

Truck tractors with air brake systems will definitely have ABS if built after March 1...?

1999

2000

1998

1997

3 / 25

If you push the brake pedal down when the spring brakes are on, you are risking...?

Compressor damage

Damaging the engine

Skidding

Damaging the brakes

4 / 25

Once the air system is fully charged and you have turned off the engine and released the parking brake, in a single vehicle the pressure should not drop by more than how many PSI per minute?

5 / 25

If the air pressure does not build fast enough after turning the engine on, you should...?

Not drive until the problem has been investigated

Not drive over 55 mph until the problem has been investigated

Report the problem for investigation at the next routine maintenance

Report the problem to the operator

6 / 25

During the walk-around inspection, if a slack adjuster moves slightly more than an inch where the push rod attaches to it, then...?

It's fine

It probably needs adjustment

It should be remove

It probably needs replacement

7 / 25

The modulating control valve allows you to control the...?

Parking brakes

Emergency brakes

Spring brakes

Service brakes

8 / 25

Service brakes are activated by...?

The brake pedal

Any of these

The parking brake lever

A dashboard switch

9 / 25

A modulating control valve can be used to apply spring brakes...?

Quickly

Forcefully

Instantly

Gradually

10 / 25

Which of these is not part of an air brake system?

Parking brake

Aerodynamic brake

Service brake

Emergency brake

11 / 25

What protects the tank and the rest of the air system from too much pressure?

Safety valve

Air compressor governor

Alcohol Evaporator

S-cam drum

12 / 25

Air brakes use what to function?

Air flowing over a vehicle

Compressed air

Radiator inducted air

Air gathered from vents

13 / 25

Separate air tanks to release the spring brakes when the main air brake system has failed should only be used...?

Once per trip

In emergencies

To get to a mechanic

In none of these situations

14 / 25

With the engine off and the parking brake released in a combination vehicle, the pressure should not drop by more than how many PSI per minute?

15 / 25

The most common type of foundation brake found on heavy vehicles is the...?

Slack adjuster

Dual air brake

compressor governor

S-cam drum

16 / 25

If the pressure drops at higher than the recommended rate when the engine is turned off and the parking brake released, it could be indicative of...?

Air leakage

Faulty compressor

Badly adjusted brakes

Water in the system

17 / 25

All air brake equipped vehicles have Air supply pressure gauge.

TRUE

FALSE

18 / 25

In air brake vehicles, the parking brakes should be used...?

When parking downgrade only

Any time the vehicle is parked

Only on emergencies

When parking uphill only

19 / 25

The brake pedal in an air brake system controls the air pressure applied to the brakes.

FALSE

TRUE

20 / 25

The main purpose of the alcohol evaporator is to put alcohol in the air system.

FALSE

TRUE

21 / 25

The air compressor runs off...?

The wheels

External air pressure

The engine

Its own battery

22 / 25

With your engine at operating RPM, in a dual air system the pressure should build from 85 to 100 psi within...?

60 seconds

75 seconds

25 seconds

45 seconds

23 / 25

Emergency brake systems use...?

Parts of both the service and parking brake systems

None of these

Parts of the service brake system

Parts of the parking brake system

24 / 25

In newer vehicles, parking brakes are controlled using a diamond shaped control knob of what color?

Red

Green

Blue

Yellow

25 / 25

Which of the following statements are true?

You can leave your vehicle unattended without applying the parking brakes or chocking the wheels

Never leave your vehicle unattended without applying the parking brakes or chocking the wheels

Your score is