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Ontario Z Air Brake Endorsement Practice Test 2026

The Z endorsement lets you drive vehicles with air brakes in Ontario. You take an approved course, then pass a knowledge test and a practical test at DriveTest. These original questions follow the Official Air Brake Handbook.

  • 商用车辆
  • 安大略省
  • 70道题
  • 核对于2026年10月10日

快速解答

主办机构：Ministry of Transportation of Ontario (MTO); tests at DriveTest centres。 在这里免费练习70道题，每道题都附有答案和解释。 已于2026年10月10日根据官方资料核对。

练习前先阅读先阅读《Ontario Z Air Brake Study Guide》：通俗易懂的笔记、图解和需要牢记的数字。

  1. 第1题，共25题

    In Ontario, which vehicles need a Z endorsement on your licence?
    显示答案

    答案: B. Vehicles with air brakes or air-over-hydraulic brakes

    You need a Z endorsement to drive any vehicle with air brakes or air-over-hydraulic brakes.

  2. 第2题，共25题

    What is the first step to get a Z endorsement in Ontario?
    显示答案

    答案: A. Take an air brake endorsement course from an approved provider

    You first take an air brake course from a fleet owner, community college or safety organization.

  3. 第3题，共25题

    After your air brake course, you receive a referral envelope. Within how long must you take it to a DriveTest centre?
    显示答案

    答案: B. 6 months

    Take the referral envelope to a DriveTest centre within 6 months.

  4. 第4题，共25题

    You hold a Class D licence and want a Z endorsement. Who must give your air brake course?
    显示答案

    答案: D. A vehicle fleet owner

    Holders of B, C, D, E, F or G licences must take the course through a fleet owner. Class A holders upgrading may use any of the three provider types.

  5. 第5题，共25题

    Which tests must you pass at DriveTest to get the Z endorsement?
    显示答案

    答案: D. An air brake knowledge test and a practical test

    You pass the air brake knowledge test and then book and pass the practical test.

  6. 第6题，共25题

    What is the difference between version 1 and version 2 of the air brake practical test?
    显示答案

    答案: D. Version 1 is for tractor-trailer air systems; version 2 is for other vehicles

    Version 1 covers vehicles with a tractor-trailer air brake system; version 2 covers vehicles without that system.

  7. 第7题，共25题

    Which item must you bring to the air brake practical test?
    显示答案

    答案: A. Wheel chocks and a watch or stopwatch with a second hand

    Bring wheel chocks, a timing device, a way to hold the brake pedal down and tools to mark and measure push rod stroke.

  8. 第8题，共25题

    In the air brake practical exam, which brake adjustment method must you demonstrate?
    显示答案

    答案: B. The applied push rod stroke measurement method

    Candidates must show the applied method of measuring push rod stroke.

  9. 第9题，共25题

    Since September 1, 2023, what do Class A or D drivers with a Z endorsement complete before renewing their licence?
    显示答案

    答案: D. An online Air Brakes Refresher Training module

    The online refresher module replaced the air brake knowledge test at renewal.

  10. 第10题，共25题

    What must Z-endorsed drivers aged 80 or older do every year?
    显示答案

    答案: D. Complete the online module and an air brake practical test

    At 80 and older, you must complete the online module and practical test every year.

  11. 第11题，共25题

    What is the typical normal operating range of an air brake system?
    显示答案

    答案: B. 690 to 828 kPa (100 to 120 psi)

    Most systems run between 690 and 828 kPa (100 to 120 psi).

  12. 第12题，共25题

    What does the governor do?
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    显示答案

    答案: C. It controls when the compressor cuts in and cuts out

    The governor tells the compressor when to start (cut in) and stop (cut out) pumping air into the system.

  13. 第13题，共25题

    According to the Ontario handbook, what is the highest allowed governor cut-out pressure?
    显示答案

    答案: C. 1000 kPa (145 psi)

    The cut-out pressure must not be above 1000 kPa (145 psi).

  14. 第14题，共25题

    What is the lowest allowed governor cut-in pressure?
    显示答案

    答案: D. 552 kPa (80 psi)

    The cut-in pressure must not be below 552 kPa (80 psi).

  15. 第15题，共25题

    What is the usual difference between the governor's cut-out and cut-in pressures?
    显示答案

    答案: B. 138 to 173 kPa (20 to 25 psi)

    The cut-in pressure is usually 138 to 173 kPa (20 to 25 psi) below the cut-out pressure.

  16. 第16题，共25题

    At about what pressure does the supply tank safety valve normally open?
    显示答案

    答案: D. 1035 kPa (150 psi)

    The safety valve protects the system from too much pressure. It normally opens at 1035 kPa (150 psi).

  17. 第17题，共25题

    The low air pressure warning must come on before pressure drops below what level?
    显示答案

    答案: B. 380 kPa (55 psi)

    The warning is defective if it does not activate or if it activates below 380 kPa (55 psi). Most activate at 414 kPa (60 psi) or higher.

  18. 第18题，共25题

    About how much air pressure is needed to fully release (hold off) spring brakes?
    显示答案

    答案: D. 414 kPa (60 psi)

    Spring brakes need about 414 kPa (60 psi) to be fully released. Below that, the springs start to apply the brakes.

  19. 第19题，共25题

    As air pressure drops, in what range does the trailer supply valve close by itself?
    显示答案

    答案: C. 138 to 311 kPa (20 to 45 psi)

    The trailer supply valve pops out automatically between 138 and 311 kPa (20 and 45 psi).

  20. 第20题，共25题

    The low air warning comes on while you are driving. What should you do?
    显示答案

    答案: A. Stop safely as soon as possible and find the cause

    Low pressure means you are losing braking power and spring brakes may soon apply. Stop safely and find the problem.

  21. 第21题，共25题

    What is a wig wag?
    显示答案

    答案: B. A warning arm that drops into view when air pressure is low

    A wig wag drops into the driver's view when system pressure falls too low.

  22. 第22题，共25题

    Before testing the low air warning, the system should have at least what pressure?
    显示答案

    答案: C. 621 kPa (90 psi)

    Build pressure to at least 621 kPa (90 psi), turn the ignition on, then press and release the brake pedal until the warning comes on.

  23. 第23题，共25题

    During the build-up test, how long may it take for pressure to rise from 587 to 690 kPa (85 to 100 psi) at 600 to 900 rpm?
    显示答案

    答案: B. No more than 2 minutes

    If build-up from 587 to 690 kPa takes more than two minutes, the system is defective.

  24. 第24题，共25题

    How long do you watch the gauge during the air-loss rate test?
    显示答案

    答案: C. 1 minute

    The air-loss test measures the pressure drop over one minute.

  25. 第25题，共25题

    In the air-loss test, what is the most pressure a straight truck, tractor or bus may lose in one minute?
    显示答案

    答案: A. 21 kPa (3 psi)

    A single vehicle may lose no more than 21 kPa (3 psi) per minute.

考前须知

  • You need a Z endorsement to drive any vehicle with air brakes or air-over-hydraulic brakes.
  • First take an air brake course from a fleet owner, community college or safety organization, then take the referral envelope to DriveTest within 6 months.
  • You must pass an air brake knowledge test and a practical test. The practical test has two versions, for vehicles with and without a tractor-trailer air brake system.
  • The low air warning must not come on below 380 kPa (55 psi), and the governor cut-out must not be above 1000 kPa (145 psi).
  • A single vehicle may lose no more than 21 kPa (3 psi) a minute in the air-loss test; a tractor and trailer no more than 28 kPa (4 psi).
  • Since September 1, 2023, an online Air Brakes Refresher module replaces the knowledge test when you renew.

常见问题

How do I get a Z endorsement in Ontario?

Complete an approved air brake course, take the referral envelope to DriveTest within 6 months, pass the air brake knowledge test, then book and pass the practical test.

What should I bring to the air brake practical test?

Wheel chocks, a watch or stopwatch, a way to hold the brake pedal down, and tools to mark and measure push rod stroke. Know your brake chamber sizes and types.

How many questions are on the Z knowledge test?

The ministry pages do not publish a question count. Our mock exam uses 30 questions with an 80% target as practice.

Do I retake the air brake test when I renew?

Since September 1, 2023, you complete an online Air Brakes Refresher module instead. Drivers aged 80 and older also take a practical test every year.

资料来源

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