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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.

The answer is between 30 and 35 feet.

1 / 20

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

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

2 / 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.

3 / 20

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

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

4 / 20

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

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

5 / 20

What is the S-cam used for?

Avoid disengaging the drivetrain before the engine slows down.

6 / 20

When stopping, If your vehicle is equipped with a manual transmission, do not ___________________ until the engine rpm is close to idle.

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

7 / 20

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

ABS may or may not result in faster stops depending on the situation.

8 / 20

You ______ be able to to stop faster if your vehicle is equipped with ABS.

Crack length is measured relative to the area where the brake makes contact.

9 / 20

Brake drums (or discs) must not have cracks longer than one half the width of the _________ area.

Think about where compressed air travels when the pedal is pressed.

10 / 20

When you press on the brake pedal:

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

11 / 20

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

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

12 / 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.

13 / 20

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

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

14 / 20

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

The warning must activate before pressure falls to 55 psi.

15 / 20

The low air pressure warning signal must come on before the pressure in the tank with the lowest pressure reaches _____.

The acceptable pressure loss with brakes released is a very small amount — just 2 psi.

16 / 20

With a fully-charged air system, the engine off, and the parking brake released the there should be no more than _______ in one minute.

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

17 / 20

The holding power of the spring brakes:

A failed warning signal can lead to multiple dangerous outcomes.

18 / 20

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

Air brakes do consist of three distinct systems.

19 / 20

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

At 55 mph a large vehicle needs more than 400 feet to come to a complete stop.

20 / 20

The total stopping distance for an average driver in a large vehicle driving 55 mph is over:

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.