CDL Air Brakes Test #2 | Free Practice Questions & Answers

Air Brakes Test #2
(english)

Air Brakes Test #2 (en)

1 / 25

When you use the brakes, the brake shoes will push against the:

Brake drum or disc.

Wheel axle

Tire rim

2 / 25

What can legally keep the parking or emergency brakes on trucks, tractor-trailers, or buses in place?

Magnetic force

Spring pressure.

Gravity

3 / 25

The supply pressure gauge tell you ____.

How much pressure is in the air tanks.

The temperature of the air compressor

The speed of the vehicle

4 / 25

The safety valve will automatically let go of extra pressure when the pressure hits ____ psi.

100

150

5 / 25

The application pressure gauge shows how much air pressure you ____.

Are applying to the brakes.

Need to refill the air compressor.

Have in the hydraulic fluid system

6 / 25

Why do brakes that use air take longer to work than those that use liquid?

Air brakes have larger pistons.

Air brakes take more time to flow through the lines than hydraulic fluid.

Air brakes need to warm up before use.

7 / 25

If your truck or bus has a dual-air brake system and one of them shows a low air pressure warning, what should you do?

Check your mirrors for traffic before deciding to continue driving.

Stop right away and safely park. Continue only after the system is fixed.

Increase your speed to reach your destination quicker.

8 / 25

How should you check the free play of S-cam brakes' manual slack adjusters?

Park on a slope, engage the parking brake, and check with the engine running.

Park on level ground, chock the wheels and release the parking brakes.

Park on a slope and check without chocking the wheaels.

9 / 25

If you need to stop quickly because of an emergency, you should brake in a manner that lets you _____.

Switch to neutral and let the vehicle coast.

Tap the gas pedal lightly before braking

Keep your vehicle in a straight line.

10 / 25

When should you use the parking brake on a vehicle with air brakes?

Any time when vehicle is parked.

Only during vehicle inspection

When making a quick stop

11 / 25

What is the purpose of draining compressed air tanks of water?

Water can freeze in cold weather and cause brake failure.

Water low boiling point reduces braking power.

To prevent air leaks in the tires.

12 / 25

What should you do first and right away when the low air pressure alarm goes off?

Stop and safely park as soon as possible.

Check the tires.

Continue driving and monitor the situation.

13 / 25

If you keep pushing and letting go of the pedal over and over, it could cause ___.

A loss of brake air pressure.

A buildup of brake air pressure.

Increased fuel consumption

14 / 25

How many feet does a truck or bus with air brakes need to stop if going 55 mph under perfect conditions?

Exactly 150 feet.

Exactly 250 feet.

More than 300 feet.

15 / 25

All vehicles with air brakes have:

An automatic pressure adjustment system.

A supply pressure gauge.

A manual air control valve

16 / 25

If you have to stop quickly in an emergency, make sure you brake in a way that:

Will allow you to steer and keep your vehicle in a straight line.

Will allow you to turn sharply to avoid obstacles.

Will make your vehicle spin to reduce speed.

17 / 25

When driving down a long and steep hill, using the brakes should only be an extra help to:

Use of spring brakes.

The use of the front brakes limiting valve.

The braking effect of the engine.

18 / 25

The braking power of the spring brakes:

Decreases as the speed of the vehicle increases.

Depends on the brakes being in adjustment.

Increases when the vehicle is fully loaded.

19 / 25

What is the purpose of the S-cam?

Rotates the wheels at different speeds for better handling.

Adjusts the tire pressure for optimal braking.

Forces the brake shoes against the inside of the brake drum.

20 / 25

Spring brakes are usually held back by ____ during normal driving.

Air pressure.

Hydraulic fluid

Magnetic force

21 / 25

A truck or bus emergency or parking brakes can be legally held by a/an ____ pressure.

Hydraulic

Magnetic

Spring

22 / 25

To go down a steep, long grade, select the right gear first. Then, to brake correctly, slow down until you're going about ______ miles per hour slower than the speed limit, and then release the brakes.

5 mph

20 mph

25 mph

23 / 25

In vehicles with dual parking control valves, you can use pressure from a separate tank to ____.

Release the spring emergency/parking brakes to move a short distance.

Check the tire pressure without exiting the vehicle.

Fill the fuel tank without going to a gas station.

24 / 25

How can you check that your service brakes are functioning properly?

Drive at a high speed, then slam on the brakes to see if the vehicle stops quickly.

Park on a slight slope, drain off air pressure, set the parking brake and check movement.

Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly.

25 / 25

To check if the air service brakes function properly, you should:

Brake gently while the vehicle is in neutral.

Press the brake pedal repeatedly while the vehicle is stationary.

Brake firmly while slowly moving forward.

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Air Brakes Test #1 (english)

Air Brakes Test #3 (english)

Air Brakes Test #4 (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.