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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.

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

1 / 20

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

The delay between pedal press and brake engagement has a two-word name.

2 / 20

The time required for the air to flow through the lines to the brakes is called _________ _________.

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

3 / 20

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

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

4 / 20

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

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

5 / 20

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

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

6 / 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.

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

7 / 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.

Avoid disengaging the drivetrain before the engine slows down.

8 / 20

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

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

9 / 20

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

Each brake application on a downgrade should last approximately 3 seconds.

10 / 20

Brake application should last about _______ seconds to reduce your speed to approximately 5 mph under your “safe” speed.

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

11 / 20

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

The warning must activate before pressure falls to 55 psi.

12 / 20

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

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

13 / 20

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

This brake responds specifically to the parking brake control.

14 / 20

The parking brake applies and releases:

The evaporator helps prevent a specific weather-related hazard in the brake valves.

15 / 20

If your vehicle is equipped with an alcohol evaporator it is there to:

A malfunctioning governor can create unsafe operating conditions.

16 / 20

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

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

17 / 20

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

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

18 / 20

The service brake applies and releases:

Controlled braking depends on having a sufficient supply of a key resource.

19 / 20

In a vehicle equipped with air brakes, controlled braking is only possible when:

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

20 / 20

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

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.