Air Brakes Test #4 (en)

Air Brakes Test #4
(english)

1 / 24

When checking for air leaks in the air brake system, you should turn off the engine and hold the brake pedal down for one minute. The air pressure shouldn't go down by more than ____ during that time.

8 psi

7 psi

3 psi

10 psi

2 / 24

Your truck got up to 40 mph going down a steep hill. You have to use your brakes to slow it down until it's going ____ mph.

25 mph

20 mph

35 mph

40 mph

3 / 24

What's the most important thing to know about hard braking?

Increases fuel efficiency

Improves tire traction.

Don't lock the wheels for longer than a split second

Brake pads will wear out faster

4 / 24

How can you make sure the air compressor governor is working correctly?

Listen for strange noises coming from the air compressor.

Raise the air pressure until the air compressor is turned off and then lower the air pressure; keep stepping on and off the brake pedal until the air compressor turns on.

Turn the engine on and off repeatedly to check if the air compressor responds.

None of the above

5 / 24

Why does the alcohol evaporator release the evaporated alcohol into the air system?

To make the brakes smell nice.

To cool down the engine.

To prevent ice buildup in the air brake system

6 / 24

What will happen if the low air pressure warning signal is not working correctly?

The vehicle's fuel efficiency will improve.

In a single-circuit air system, it could cause the brakes to stop quickly in an emergency

The vehicle's speed will increase due to reduced air resistance.

None of the above

7 / 24

Which of the following statements about slack adjusters is correct?

Component of your air brake system that is responsible for making adjustments to the brakes.

They are located between the push rod and S-Cam on drum brakes.

They are located between the power screw and push rod on disc brakes.

All of the above

8 / 24

If your ABS stops working, which of these is correct about your brakes?

Your brake lights will stop working.

Your brakes will only work at low speeds.

You will still be able to use your brakes but need to get the ABS fixed soon.

The ABS will work again if you pump your brake pedal

9 / 24

Which of the following statements about spring brakes is correct?

Consisting of strong springs that are kept in place by air pressure when driving.

Until your air pressure drops to a particular range, often 20 to 30 psi, spring brakes will not exert its full effect.

Emergency brakes on a truck or tractor that activate when the air pressure gets too low.

All of the above

10 / 24

Which of the following statements about a dual air brake system is correct?

One system controls the front axle brakes while the other system controls the rear axle brakes.

One system controls the driver's side of brakes while the other system controls the passenger's side brakes.

Installed on dual-tire vehicles only where one system controls the outer wheel's brakes while the other system controls the inner wheel's brakes.

A system which has twice the standard vehicle's braking power.

11 / 24

How thick do the drum linings have to be according to the government rules on air brakes?

1/8 inch

1/4 inch

3/8 inch

1/2 inch

12 / 24

If you want to stop as quickly as you can when driving a vehicle without anti-lock brakes, the most effective technique is ________.

The controlled braking technique

The stab braking technique

Both techiques will help stop the vehicle quickly.

13 / 24

What does the S-cam do?

Helps to cool down the engine faster

Increases fuel efficiency by optimizing air flow.

Push the brake shoes against the inside of braking drum

14 / 24

The tractor protection valve _____.

Supplies the braking system with air.

Automatically closes if the air supply falls below a particular threshold.

Can be closed by applying the parking brakes.

All of the above

15 / 24

How do you make sure the slack adjusters in your truck are okay?

Use gloves and pull hard on each slack adjuster that you can reach.

Check the vehicle's oil level.

Inspect the tire tread depth.

All of the above

16 / 24

Which one of these is NOT included in the air brake system?

Service brake system

Emergency brake system

Radio signal system

Parking brake system

17 / 24

When you use the parking brakes, _______ .

Locking the wheels immediately.

Taking air out of the brake chambers.

Releasing air from the tires.

18 / 24

What does the ABS do?

Regulates the engine speed.

Makes the vehicle go faster.

Turns on when the wheels are about to lock up

Always decreases the stopping distance significantly.

19 / 24

Air brakes work by using ____ to operate the brakes.

Hydrogen

Carbon dioxide

Pressurized air

Nitrogen

20 / 24

The maximum permissible rate of air pressure loss in the braking system of a vehicle when the brakes are applied and the engine is off is _______.

5 psi for single and 6 psi for combination

2 psi for single and 3 psi for combination.

7 psi for single and 8 psi for combination

4 psi for single and 5 psi for combination.

21 / 24

If the braking system fails, the emergency braking system can use to stop the vehicle.

Parts of the service and parking brakes

Gravity and wheel friction

The vehicle's momentum

22 / 24

What are spring brakes?

They are special brakes used only for parking on steep hills.

If the air brakes lose pressure, the spring brakes will activate to stop the vehicle.

They are advanced brakes that automatically adjust based on the weight of the cargo.

They are a type brakes designed to work more effectively during the Spring season

23 / 24

Can you adjust the automatic slack adjuster manually?

Never adjust it manually.

Adjust it after every long trip.

When it's not working properly.

Always adjust it in every inspection.

24 / 24

What is true about a dual air brake system?

Only one set of brake controls is used.

One system controls the front axle and another the rear

One is called the "primary" system and one is called the "secondary" system.

All of the above

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Air Brakes Test #1 (english)

Air Brakes Test #2 (english)

Air Brakes Test #3 (english)

What is the CDL Air Brakes Test?

The CDL Air Brakes test is a written exam that covers the principles of air brake operation, inspection, and maintenance. The test is designed to ensure that drivers understand how air brakes work and how to operate them safely. This test is required for any driver who wants to operate a commercial vehicle equipped with air brakes. This page provides resources and information to help you prepare and pass the exam.

Who Needs to Take the CDL Air Brakes Test?

Anyone who wants to drive a commercial vehicle with air brakes is required to take and pass this test. This includes drivers who want to operate:

Tractor-trailers
Buses
Trucks with a GVWR of 26,001 pounds or more

Why are Practice Tests Important?

Practicing for the CDL Air Brakes test is crucial for success. Here’s why:

Familiarization: Practice tests help you become familiar with the format of the real exam, the types of questions you’ll encounter, and the time constraints.
Knowledge Assessment: They allow you to assess your current knowledge and identify areas where you need to focus your studies.
Confidence Building: Taking practice tests and seeing your progress can boost your confidence and reduce test anxiety.
Improved Performance: Studies have shown that students who use practice tests perform significantly better on exams.

Air Brakes Test #4 (en)