Ontario AZ Licence Practice Test 2026: Teste prático 4

1. Pergunta 1 de 25

   What applies the spring brakes?

   • AThe driver's foot on the pedal
   • BA large spring, which air pressure holds back
   • CAir pressure pushing on the diaphragm
   • DHydraulic fluid
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   Resposta: B. A large spring, which air pressure holds back

   Spring brakes are applied by a strong spring and released by air pressure, so they apply when air is lost.

2. Pergunta 2 de 25

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

   • A690 kPa (100 psi)
   • B380 kPa (55 psi)
   • C138 kPa (20 psi)
   • D552 kPa (80 psi)
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   Resposta: 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.

3. Pergunta 3 de 25

   What is the adjustment limit for a type 30 long-stroke chamber?

   • A64 mm (2-1/2 inches)
   • B89 mm (3-1/2 inches)
   • C45 mm (1-3/4 inches)
   • D51 mm (2 inches)
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   Resposta: A. 64 mm (2-1/2 inches)

   A type 30 long-stroke chamber (with square ports and stroke markings) has a 64 mm (2-1/2 inch) limit.

4. Pergunta 4 de 25

   How often should you check the push rod stroke (brake adjustment)?

   • AAt least daily
   • BOnly after a crash
   • COnce a month
   • DOnce a year
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   Resposta: A. At least daily

   The handbook says brake adjustment should be checked at least daily.

5. Pergunta 5 de 25

   What helps reduce brake heat on long downgrades?

   • AShifting to neutral
   • BPumping the brake pedal quickly
   • CUsing an engine brake or retarder
   • DTurning off the air compressor
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   Resposta: C. Using an engine brake or retarder

   Engine brakes and retarders slow the vehicle without heating the service brakes.

6. Pergunta 6 de 25

   How do you know the tractor protection valve is defective during the test?

   • AThe low air warning comes on at 414 kPa (60 psi)
   • BAir exhausts from the trailer service line when you press the pedal
   • CThe trailer spring brakes apply when you close the supply valve
   • DThe governor cuts out at 828 kPa (120 psi)
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   Resposta: B. Air exhausts from the trailer service line when you press the pedal

   With the trailer supply closed, pressing the pedal should not send air out of the trailer service line.

7. Pergunta 7 de 25

   When draining the air tanks at the end of the pre-trip check, which tank do you drain first?

   • AThe primary tank
   • BThe secondary tank
   • CThe supply (wet) tank
   • DThe trailer tank
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   Resposta: C. The supply (wet) tank

   Drain the supply tank first, because it collects most of the water and oil, then check each drain valve.

8. Pergunta 8 de 25

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

   • AAdjusting the slack adjusters yourself
   • BThe applied push rod stroke measurement method
   • CKicking the tires
   • DListening to the brakes while driving
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   Resposta: B. The applied push rod stroke measurement method

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

9. Pergunta 9 de 25

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

   • AWheel chocks and a watch or stopwatch with a second hand
   • BA tire iron and a jack for the steering axle
   • CA spare brake chamber and a set of wrenches
   • DA second licensed driver to hold the steering wheel
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   Resposta: 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.

10. Pergunta 10 de 25

    What does the air dryer do?

    • ADries the tires after driving through rain
    • BRemoves moisture before air enters the supply tank
    • CMeasures the air pressure in each tank
    • DHeats the brake drums so they work in winter
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    Resposta: B. Removes moisture before air enters the supply tank

    The air dryer removes moisture before the air reaches the supply tank.

11. Pergunta 11 de 25

    If you double both your weight and your speed, how much longer is the stopping distance?

    • ATwo times longer
    • BFour times longer
    • CEight times longer
    • DSixteen times longer
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    Resposta: C. Eight times longer

    Doubling both weight and speed makes the stopping distance eight times longer.

12. Pergunta 12 de 25

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

    • ATake an air brake endorsement course from an approved provider
    • BPass a medical exam at a hospital or clinic
    • CDrive a vehicle with air brakes for six months
    • DBook a road test in a tractor-trailer at DriveTest
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    Resposta: 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.

13. Pergunta 13 de 25

    What is the adjustment limit for a standard type 30 clamp-type brake chamber?

    • A76 mm (3 inches)
    • B32 mm (1-1/4 inches)
    • C51 mm (2 inches)
    • D64 mm (2-1/2 inches)
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    Resposta: C. 51 mm (2 inches)

    A standard type 30 chamber has an adjustment limit of 51 mm (2 inches).

14. Pergunta 14 de 25

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

    • A0 to 69 kPa (0 to 10 psi)
    • B552 to 690 kPa (80 to 100 psi)
    • C138 to 311 kPa (20 to 45 psi)
    • D690 to 828 kPa (100 to 120 psi)
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    Resposta: 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).

15. Pergunta 15 de 25

    You find an air brake defect during your inspection. What does Ontario law say about driving the vehicle?

    • AIt is illegal to drive a defective vehicle, and you must report the defect
    • BYou may drive it if the load is light or the trailer is empty
    • CYou may drive it if you drive carefully and below 50 km/h
    • DYou may drive it for up to 7 days before getting it fixed
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    Resposta: A. It is illegal to drive a defective vehicle, and you must report the defect

    Drivers must report defects, and it is illegal to drive a defective vehicle.

16. Pergunta 16 de 25

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

    • A5 minutes
    • B15 minutes
    • C1 minute
    • D10 seconds
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    Resposta: C. 1 minute

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

17. Pergunta 17 de 25

    What makes an air tank defective in the mechanical inspection?

    • AIt is not securely mounted
    • BIt has some water in it before draining
    • CIt has a drain valve
    • DIt is painted
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    Resposta: A. It is not securely mounted

    Air tanks must be securely mounted.

18. Pergunta 18 de 25

    What are foundation brakes?

    • AThe brake parts at each wheel, such as drums and shoes
    • BThe concrete pads that trucks park on at terminals
    • CThe brakes on the trailer's landing gear legs
    • DThe engine brake that slows the vehicle on hills
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    Resposta: A. The brake parts at each wheel, such as drums and shoes

    Foundation brakes are the wheel-mounted parts, such as drums or rotors and shoes or pads, worked by the air system.

19. Pergunta 19 de 25

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

    • A690 kPa (100 psi)
    • B552 kPa (80 psi)
    • C1380 kPa (200 psi)
    • D1035 kPa (150 psi)
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    Resposta: D. 1035 kPa (150 psi)

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

20. Pergunta 20 de 25

    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?

    • ANo more than 10 seconds
    • BNo more than 2 minutes
    • CNo more than 5 minutes
    • DNo more than 10 minutes
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    Resposta: B. No more than 2 minutes

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

21. Pergunta 21 de 25

    How do you test the spring (parking) brakes' holding ability?

    • AWith them applied, gently apply engine power and see if they hold
    • BDrain all the air tanks first, then try to roll the vehicle
    • CDrive at highway speed and pull the parking brake control
    • DRelease the spring brakes and push the pedal hard
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    Resposta: A. With them applied, gently apply engine power and see if they hold

    The spring brakes are defective if they do not hold the vehicle still when engine power is applied gently.

22. Pergunta 22 de 25

    Which brake drum condition is a defect?

    • AA crack or break in the drum
    • BA drum that is warm after driving
    • CDust on the outside of the drum
    • DA drum painted black
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    Resposta: A. A crack or break in the drum

    Inspect brake drums or rotors for cracks or breaks.

23. Pergunta 23 de 25

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

    • A1200 kPa (175 psi)
    • B828 kPa (120 psi)
    • C1000 kPa (145 psi)
    • D1035 kPa (150 psi)
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    Resposta: C. 1000 kPa (145 psi)

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

24. Pergunta 24 de 25

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

    • AVersion 2 is only for people who failed version 1 before
    • BVersion 1 is for buses and version 2 is for straight trucks only
    • CVersion 1 is given in English and version 2 is given in French
    • DVersion 1 is for tractor-trailer air systems; version 2 is for other vehicles
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    Resposta: 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.

25. Pergunta 25 de 25

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

    • AOnly tractor-trailers with a trailer over 4,600 kg
    • BVehicles with air brakes or air-over-hydraulic brakes
    • COnly school buses and other passenger vehicles
    • DAny vehicle with anti-lock brakes, of any type
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    Resposta: 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.

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