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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.

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

1 / 20

When you press on the brake pedal:

Air brakes are named after the medium that powers them.

2 / 20

What do air brakes use to make the brakes work?

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

3 / 20

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

Front wheel brakes provide effective stopping power in every condition.

4 / 20

Front wheel brakes are good under all conditions.

Only one type of mechanical force is legally approved to hold parking/emergency brakes.

5 / 20

What can legally hold a parking or emergency brake in position?

Controlled braking is designed specifically to prevent wheel lockup.

6 / 20

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

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

7 / 20

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

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

8 / 20

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

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

9 / 20

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

Slippery roads and a specific brake type are a dangerous combination.

10 / 20

Vehicles on __________ roads may skid out of control when the __________ brakes come on.

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

11 / 20

Why must air tanks be drained?

A malfunctioning governor can create unsafe operating conditions.

12 / 20

A bus may not be safe to drive if the governor does not work properly.

Contaminants in compressed air are harmful rather than helpful to brake components.

13 / 20

Oil and water in the compressed air helps to lubricate your brake components.

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

14 / 20

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

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

15 / 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.

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

16 / 20

What is a supply pressure gauge used for?

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

17 / 20

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

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

18 / 20

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

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

19 / 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.

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

20 / 20

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

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.