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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.

The target build-up time is 45 seconds.

2 / 20

When the engine is at operating speed the rate of air pressure buildup should be from 85 to 100 psi within

The answer is between 30 and 35 feet.

3 / 20

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

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

4 / 20

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

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

5 / 20

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

The compressor cuts in at 100 psi and cuts out at 125 psi.

6 / 20

Pumping by the air compressor should start at about _____ psi (cut-in pressure) and stop at about _____ psi (cut-out pressure).

Air brakes are named after the medium that powers them.

7 / 20

What do air brakes use to make the brakes work?

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

8 / 20

Under which conditions are front wheel brakes good?

Excessive heat causes a specific type of brake performance loss.

9 / 20

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

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

10 / 20

Each air storage tank is equipped with a ________ valve in the bottom.

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

11 / 20

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

Vehicle speed itself is not a component of stopping distance — it’s what the distance depends on.

12 / 20

The total stopping distance for vehicles equipped with air brakes is made up of all these factors except:

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.

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

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

15 / 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.

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

16 / 20

The service brake applies and releases:

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

17 / 20

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

Maintaining directional control is the priority during emergency braking.

18 / 20

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

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

19 / 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.

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

20 / 20

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

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.