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 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?

2 / 25

Spring brakes...?

Are held by safety valve

Are held by mechanical force

Are held by brake drum

Are held by S-cam drum

3 / 25

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

FALSE

TRUE

4 / 25

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

Emergency brakes

Parking brakes

Spring brakes

Service brakes

5 / 25

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

Air compressor governor

Safety valve

S-cam drum

Alcohol Evaporator

6 / 25

All air brake equipped vehicles have Air supply pressure gauge.

TRUE

FALSE

7 / 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...?

Water in the system

Badly adjusted brakes

Faulty compressor

Air leakage

8 / 25

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

Report the problem for investigation at the next routine maintenance

Report the problem to the operator

Not drive over 55 mph until the problem has been investigated

Not drive until the problem has been investigated

9 / 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

10 / 25

The air compressor runs off...?

Its own battery

The wheels

The engine

External air pressure

11 / 25

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

Parking brake

Emergency brake

Service brake

Aerodynamic brake

12 / 25

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

Compressor damage

Damaging the brakes

Damaging the engine

Skidding

13 / 25

Service brakes are activated by...?

A dashboard switch

The parking brake lever

The brake pedal

Any of these

14 / 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?

15 / 25

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

TRUE

FALSE

16 / 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 adjustment

It's fine

It should be remove

It probably needs replacement

17 / 25

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

When parking uphill only

Any time the vehicle is parked

When parking downgrade only

Only on emergencies

18 / 25

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

To get to a mechanic

Once per trip

In none of these situations

In emergencies

19 / 25

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

Instantly

Forcefully

Gradually

Quickly

20 / 25

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

Dual air brake

compressor governor

Slack adjuster

S-cam drum

21 / 25

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

1999

1998

1997

2000

22 / 25

Air brakes use what to function?

Compressed air

Radiator inducted air

Air gathered from vents

Air flowing over a vehicle

23 / 25

Emergency brake systems use...?

Parts of the service brake system

Parts of both the service and parking brake systems

Parts of the parking brake system

None of these

24 / 25

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

60 seconds

25 seconds

45 seconds

75 seconds

25 / 25

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

Red

Green

Blue

Yellow

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.