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Air Brake – Learn Mode

You must take the Air Brake Knowledge Test if your vehicle has air brakes, including air over hydraulic brakes. The test is twenty questions and you must score 80% to pass. This practice test randomly chooses twenty questions each time you take it.

Maintaining directional control is the priority during emergency braking.

1 / 20

If somebody pulls out in front of you brake in a way that keeps your vehicle ______________.

Pressure should reach a range between 85 and 100 psi within the time limit.

2 / 20

When engine is at operating speed the air pressure should build from ____________ psi within 45 seconds.

Passing the emergency brake test does not eliminate the need for a tug test.

3 / 20

If your vehicle passes the emergency brake test it is not necessary to perform a tug test.

The answer is between 30 and 35 feet.

4 / 20

On dry roads the brake lag distance at 55 mph is about ____ feet.

Air pressure triggers an electric switch that activates the brake lights.

5 / 20

When you put your brakes on the air brake system works with an electric switch, by air pressure, to turn on the brake lights.

This valve allows unwanted liquids and contaminants to be removed from the tank.

6 / 20

Each air storage tank is equipped with a ________ valve in the bottom.

Tanks must be drained to remove two types of unwanted substances that accumulate.

7 / 20

Why must air tanks be drained?

Large steering inputs during controlled braking require you to release the brakes first.

8 / 20

If you need to make large steering adjustments while using controlled braking in an emergency situation:

Some automatic drain valves include a heating element to prevent freezing.

9 / 20

Some automatic storage tank drain valves are equipped with a(n) ____________ _____________.

Opening of the safety relief valve while driving does not require an immediate stop.

10 / 20

If the safety relief valve opens while driving you should immediately stop in the next safe location.

Excessive heat causes a specific type of brake performance loss.

11 / 20

Brake _______ results from excessive heat causing chemical changes to the brake lining.

A warning signal for low air pressure is a required safety feature.

12 / 20

All vehicles with air brakes must have a low air pressure warning signal

Spring brake holding power is tied to how well the service brakes are adjusted.

13 / 20

The holding power of the spring brakes:

The target build-up time is 45 seconds.

14 / 20

When the engine is at operating speed the rate of air pressure buildup should be from 85 to 100 psi within

Air brake lag adds half a second compared to hydraulic brakes.

15 / 20

Hydraulic brakes work instantly when you push the pedal. Air brakes require an additional ______ second for the air to flow through the lines to the brakes.

This valve is a protective device designed to open at a specific pressure threshold.

16 / 20

The ______ ______ valve is set to open at 150 psi.

The missing system is the one used when the vehicle is stopped and unattended.

17 / 20

Air brakes are really three different braking systems, service brake, _____________, and emergency brake:

The cut-out pressure is in the range of 120–125 psi.

18 / 20

When air tank pressure rises to the “cut-out” level (around _____ pounds per-square-inch or “psi”), the governor stops the compressor from pumping air.

The gauge measures the quantity of a specific resource stored in the tank.

19 / 20

What is a supply pressure gauge used for?

A failed warning signal can lead to multiple dangerous outcomes.

20 / 20

If the low pressure warning signal does not work you could experience:

Exit

Tips for Getting the Most Out Of Learn Mode

  1. Actively Read the “Why” (Don’t Just Look at “Right/Wrong”) 
    • When you receive immediate feedback, the most valuable part is not whether you got it right, but why the correct answer is correct. Read the explanation carefully, even when you get it right, to confirm your reasoning matched the learning objective. 
  2. Treat Mistakes as Immediate Lessons
    • In Learn Mode, a mistake is not a failure; it is an immediate opportunity to correct a misconception. When you get a question wrong, take a moment to understand the “wrongness” of your answer before moving on, as this active, immediate correction makes it easier to remember the right answer in the future. 
  3. Actively Challenge the Distractors
    • Don’t just look for the correct answer; look at the incorrect options (distractors) and understand why they are incorrect. This helps sharpen your ability to distinguish between similar, but incorrect, concepts in a real-world scenario. 
  4. Re-engage with Content Instantly
    • If the feedback reveals a gap in your knowledge, don’t just click “Next.” Take advantage of the immediacy to look back at the training material—a slide, a document, or a video—while the question is still fresh in your mind. 
  5. Take Notes on “Corrective Feedback”
    • Maintain a “mistake log” or note-taking area. When the quiz explains why your answer was wrong, jot down the correct rationale. This transforms the immediate feedback into a study guide you can review before your final “Exam Mode” quiz. 
  6. Treat It as a “Study Session,” Not a “Test” 
    • Approach Learn Mode with a growth mindset. Because you are getting the answers immediately, there is no need to feel anxious about getting it wrong. Focus entirely on using the quiz to bridge the gap between what you thought you knew and what you actually need to know.