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

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

25 seconds

60 seconds

45 seconds

75 seconds

2 / 25

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

Red

Blue

Yellow

Green

3 / 25

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

Quickly

Gradually

Instantly

Forcefully

4 / 25

Which of the following statements are true?

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

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

5 / 25

Spring brakes...?

Are held by brake drum

Are held by safety valve

Are held by S-cam drum

Are held by mechanical force

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 probably needs replacement

It should be remove

It's fine

It probably needs adjustment

7 / 25

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

1997

2000

1999

1998

8 / 25

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

compressor governor

Slack adjuster

S-cam drum

Dual air brake

9 / 25

Emergency brake systems use...?

None of these

Parts of the parking brake system

Parts of the service brake system

Parts of both the service and parking brake systems

10 / 25

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

Parking brakes

Emergency brakes

Spring brakes

Service brakes

11 / 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?

12 / 25

Service brakes are activated by...?

The brake pedal

A dashboard switch

The parking brake lever

Any of these

13 / 25

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

FALSE

TRUE

14 / 25

The air compressor runs off...?

External air pressure

The engine

Its own battery

The wheels

15 / 25

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

When parking uphill only

Only on emergencies

When parking downgrade only

Any time the vehicle is parked

16 / 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?

17 / 25

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

Report the problem to the operator

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

18 / 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...?

Badly adjusted brakes

Water in the system

Faulty compressor

Air leakage

19 / 25

All air brake equipped vehicles have Air supply pressure gauge.

FALSE

TRUE

20 / 25

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

Damaging the brakes

Skidding

Damaging the engine

Compressor damage

21 / 25

Air brakes use what to function?

Air flowing over a vehicle

Air gathered from vents

Compressed air

Radiator inducted air

22 / 25

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

Alcohol Evaporator

S-cam drum

Safety valve

Air compressor governor

23 / 25

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

Parking brake

Service brake

Aerodynamic brake

Emergency brake

24 / 25

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

In emergencies

Once per trip

To get to a mechanic

In none of these situations

25 / 25

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

FALSE

TRUE

Your score is

CDL Practice Test Air Brakes

Air brake endorsement course
At this stage of air brake endorsement, there are two versions of the airbrake endorsement courses that are normally provided. One of them is the By vehicle fleet owners course. Drivers will need to go for a 12-hour course if they are upgrading to class AZ license. Drivers holding class B, C, D, E, F or G licenses and wishing to get a Z endorsement will go for the 10.5-hour course.

The other version of the airbrake endorsement course is By community colleges and safety organizations. Drivers upgrading to class A (Z) license will go for a 12-hour course.

After successfully completing the endorsement course, you will get a referral envelope. This is the envelope expected at the DriveTest center normally within a period of 6 months before you get a CDL air brake endorsement. Try our free CDL practice test air brakes now we have 110 questions in our online database.

There are three types of CDL classes that determine the type of vehicle you may drive and how much you may tow. A Class A CDL class allows you to operate a vehicle with a GCWR of 26,001 if the vehicle you tow weighs more than 10,000 and a Class B CDL allows you to operate a vehicle with a GVWR of 26,001 or more pounds or operate any vehicle towing another vehicle that weighs less than 10,000 GVWR. With a Class C CDL, you can operate a Class C vehicle that transports hazardous materials.