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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.

Reducing brake force helps prevent trailer swing when only the tractor has ABS.

1 / 20

When only the tractor haws ABS you should ______________ if the trailer starts to swing out.

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

2 / 20

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

Maintaining directional control is the priority during emergency braking.

3 / 20

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

The S-cam is the component that initiates braking action.

4 / 20

What is the S-cam used for?

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

5 / 20

When using stab braking during an emergency:

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

6 / 20

What is a supply pressure gauge used for?

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

7 / 20

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

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

8 / 20

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

Stab braking involves cycling hard pressure on and off in response to wheel lockup.

9 / 20

Using the stab braking method in an emergency on a vehicle equipped with air brakes you:

Excessive heat causes a specific type of brake performance loss.

10 / 20

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

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

11 / 20

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

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

12 / 20

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

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

13 / 20

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

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

14 / 20

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

With brakes applied the allowable pressure drop is slightly more than when released.

15 / 20

With your foot firmly applied to the service brake continue to hold it for one minute and there should be no more than a _______ drop in pressure.

This is the brake you use every time you press the brake pedal during normal driving.

16 / 20

The service brake applies and releases:

Controlled braking is designed specifically to prevent wheel lockup.

17 / 20

When using controlled braking in an emergency your wheels ________________ lock up.

The knob shape is one of four common geometric forms — think of a playing card suit.

18 / 20

The parking brake control on newer vehicles will be a yellow, _________ knob labeled “parking brakes”.

A lit ABS warning light calls for both normal driving and getting the vehicle serviced.

19 / 20

If the ABS warning light comes on or stays on you should:

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

20 / 20

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

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.