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British Columbia Air Brake Practice Test

British Columbia: Code 15

Updated for 2026 · 37 air brake questions of 350 across the full British Columbia commercial path · Aligned to the commercial driver's manual · See the commercial path

Start with General Knowledge first. We recommend completing it before drilling air brake questions.

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Removes the air brake restriction. Required for most heavy trucks and buses.

Study air brake questions

All 37 questions in one card, each with an explanation after you answer. No timer.

Air Brake questions

37 questions, each with an explanation.

Study mode, no timer

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Practice runs

3 runs, each a different mix of questions. Answer one at a time and see the explanation after each.

Practice run 1

Free

20 questions, a different mix in each run.

20 questions

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Practice run 2PRO20 questions, a different mix in each run.20 questionsGet ProPractice run 3PRO20 questions, a different mix in each run.20 questionsGet Pro
~26%Sample score

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About the British Columbia Air Brake test

In British Columbia, the air brake test is the Code 15, administered by ICBC. It is a single written exam that applies to any air-brake-equipped vehicle, whatever the licence class, rather than a class of its own.

Air brakes work on the opposite principle from the hydraulic brakes on a car. Air pressure holds the spring-loaded brakes off, so if the system loses air the springs apply the brakes automatically: the design fails safe. Because nearly every heavy commercial vehicle uses air brakes, this qualification is essential in practice, even though it appears as a separate result on your licence.

The knowledge test covers governor cut-out and cut-in pressure (cut-out is typically 120 to 135 psi, with cut-in 20 to 25 psi lower), the low-air warning (it must come on before pressure drops below 60 psi, or 414 kPa), the pressure at which the spring brakes apply (around 20 to 45 psi), slack-adjuster inspection, and the daily leak-down test. Many provinces add a practical demonstration to the written test.

British Columbia Air Brake Practice Test 2026 | Drive IQ Canada