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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.

Friction between brake components converts motion into a byproduct brakes are built to handle.

1 / 20

Brake shoes or pads rub against the drums or discs to slow the vehicle. This produces ________, which brakes are designed to take a lot of.

Use a non-friction method as the primary speed control on steep grades.

2 / 20

The primary braking effect on a long and/or steep downgrade should come from the:

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

3 / 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 S-cam is the component that initiates braking action.

4 / 20

What is the S-cam used for?

Automatic slack adjusters can still require manual adjustment in some situations.

5 / 20

Are automatic slack adjusters ever manually adjusted?

Stab braking combines all steps: hard application release when locked and reapplication.

6 / 20

When using stab braking during an emergency:

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

7 / 20

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

Front wheel brakes are effective regardless of road or weather conditions.

8 / 20

Under which conditions are front wheel brakes good?

Air brakes are named after the medium that powers them.

9 / 20

What do air brakes use to make the brakes work?

Low pressure build-up creates a safety risk while the vehicle is in motion.

10 / 20

If the air pressure does not build up fast enough during your final air brake test:

Spring brakes are activated by a loss of air pressure rather than by applying air.

11 / 20

What are spring brakes?

The compressor draws its power directly from the vehicle’s power source.

12 / 20

The air compressor is connected to the _________ through gears or a v-belt.

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

13 / 20

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

Effective braking requires each individual brake to carry a proportional load.

14 / 20

To safely control a vehicle, every brake must ___________..

Excessive heat causes a specific type of brake performance loss.

15 / 20

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

Maintaining directional control is the priority during emergency braking.

16 / 20

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

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

17 / 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.

18 / 20

Why must air tanks be drained?

The name of this system reflects its primary role during normal operation.

19 / 20

Which brake system applies and releases the brake when the driver uses the brake pedal?

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

20 / 20

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

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.