Alberta Class 1 Knowledge Practice Test 2026: Practice test 4

1. Question 1 of 25

   Before starting the air brake test, how should the vehicle be secured?

   • ARelease all brakes
   • BLeave it in neutral without chocks
   • CPark on a hill facing down
   • DPark on level ground and chock the wheels
   Show answer

   Answer: D. Park on level ground and chock the wheels

   Secure the vehicle with wheel chocks on level ground before testing the brakes.

2. Question 2 of 25

   In which languages is the Alberta air brake knowledge test offered?

   • AEnglish, French and Punjabi
   • BEnglish and French
   • CEnglish only
   • DAny language with a translator
   Show answer

   Answer: C. English only

   The electronic test is in English only. Paper and translated versions are not offered.

3. Question 3 of 25

   In an S-cam brake, what forces the brake shoes against the drum?

   • AA hydraulic cylinder
   • BMagnets
   • CThe driver's leg strength
   • DThe S-shaped cam turning
   Show answer

   Answer: D. The S-shaped cam turning

   When the camshaft turns, the S-cam spreads the shoes against the drum.

4. Question 4 of 25

   According to the Commercial Driver's Guide, about how long does it take a driver to perceive a hazard?

   • AAbout 0.1 seconds
   • BAbout 0.75 seconds
   • CAbout 5 seconds
   • DAbout 3 seconds
   Show answer

   Answer: B. About 0.75 seconds

   Perception time is about 0.75 seconds, and reaction time is about another 0.75 seconds.

5. Question 5 of 25

   A farmer applies for Class 1 to drive a farm-registered tractor-trailer. Does the farmer need air brake training?

   • ANo, farm-registered vehicles are always exempt
   • BYes, Class 1 applicants must show air brake training
   • COnly if the farmer drives in a city
   • DOnly for trailers longer than 53 feet
   Show answer

   Answer: B. Yes, Class 1 applicants must show air brake training

   Class 1 applicants must show proof of air brake training even when the vehicle is registered as a farm vehicle.

6. Question 6 of 25

   In the applied leakage check with full brake application, what is the most a power unit alone may lose in 2 minutes?

   • A4 psi
   • B1 psi
   • C20 psi
   • D10 psi
   Show answer

   Answer: A. 4 psi

   The guide allows a loss of 4 psi in 2 minutes for a power unit, plus 2 psi for each trailer.

7. Question 7 of 25

   Why do air tanks have drain valves?

   • ATo check the tire pressure at each wheel
   • BTo release the parking brakes by hand
   • CTo let fresh air into the tanks
   • DTo remove water and oil that collect in the tanks
   Show answer

   Answer: D. To remove water and oil that collect in the tanks

   Compressed air leaves water and oil in the tanks. Drain them so they do not freeze or damage valves.

8. Question 8 of 25

   Why is moisture in the air system a problem?

   • AIt makes the brakes grab too strongly
   • BIt cools the compressor too much in summer
   • CIt can freeze and block lines and valves
   • DIt is not a problem in a modern system
   Show answer

   Answer: C. It can freeze and block lines and valves

   Water can freeze and stop valves or lines from working. Drain tanks and use the air dryer.

9. Question 9 of 25

   In the Alberta trip test, what is the normal range for governor cut-out pressure?

   • A90 to 100 psi
   • B60 to 80 psi
   • C150 to 175 psi
   • D120 to 135 psi
   Show answer

   Answer: D. 120 to 135 psi

   The governor should cut out between 120 and 135 psi.

10. Question 10 of 25

    What happens when you press the brake pedal (foot valve) in an air brake system?

    • AAir is sent to the brake chambers, which apply the brakes
    • BThe spring brakes release so the wheels can turn
    • CThe compressor stops and the tanks are sealed
    • DAir is released from the tires to slow the wheels
    Show answer

    Answer: A. Air is sent to the brake chambers, which apply the brakes

    The foot valve sends air from the tanks to the brake chambers, which push the rods that apply the brakes.

11. Question 11 of 25

    What must you show at the registry agent before you can write the air brake knowledge test?

    • AA letter from your employer or school
    • BYour truck's registration and insurance
    • CYour Notice of Air Brake Program Completion
    • DYour Class 1 road test result
    Show answer

    Answer: C. Your Notice of Air Brake Program Completion

    Bring the Notice you received after passing the practical assessment.

12. Question 12 of 25

    Brake lag means the brakes on an air-brake vehicle take time to apply. What does this mean for following distance?

    • AYou can follow more closely
    • BFollowing distance does not matter
    • CYou should brake later
    • DYou need more space ahead than a car does
    Show answer

    Answer: D. You need more space ahead than a car does

    Air brake lag adds to your stopping distance, so leave a bigger gap.

13. Question 13 of 25

    What does the safety valve do?

    • AApplies the brakes when you go too fast
    • BReleases air if tank pressure gets too high
    • CRemoves water and oil from the tanks
    • DStops the engine if the air gets too hot
    Show answer

    Answer: B. Releases air if tank pressure gets too high

    The safety valve protects the tanks from too much pressure by letting air out.

14. Question 14 of 25

    What is the main safety feature of spring brakes?

    • AThey only work at high speed on highways
    • BThey apply automatically if air pressure is lost
    • CThey replace the service brakes when driving
    • DThey need extra air pressure to apply
    Show answer

    Answer: B. They apply automatically if air pressure is lost

    Air holds spring brakes off. If pressure is lost, the springs apply the brakes.

15. Question 15 of 25

    What is the best way to check whether a brake is out of adjustment?

    • AFeel the tire temperature after a trip
    • BLook at the paint on the brake drum
    • CListen to the brake while driving slowly
    • DMeasure the push rod stroke with the brakes applied
    Show answer

    Answer: D. Measure the push rod stroke with the brakes applied

    Brake adjustment is checked by measuring push rod stroke with a full brake application.

16. Question 16 of 25

    As you lower the air pressure during the trip test, at what pressure should the park control valve pop out?

    • AIt should never pop out
    • BBetween 60 and 80 psi
    • CBetween 20 and 45 psi
    • DBetween 100 and 120 psi
    Show answer

    Answer: C. Between 20 and 45 psi

    The park control valve should pop out between 20 and 45 psi, applying the spring brakes.

17. Question 17 of 25

    In the applied leakage check, what is the most a tractor with one trailer may lose in 2 minutes under the guide's figures?

    • A12 psi
    • B2 psi
    • C4 psi
    • D6 psi
    Show answer

    Answer: D. 6 psi

    The guide allows 4 psi for the power unit plus 2 psi for each trailer, so 6 psi for a tractor and one trailer.

18. Question 18 of 25

    How quickly should the compressor build pressure from 50 to 90 psi at the governed engine speed?

    • AWithin 10 seconds
    • BWithin 3 minutes
    • CWithin 10 minutes
    • DWithin 30 minutes
    Show answer

    Answer: B. Within 3 minutes

    Compressor build-up from 50 to 90 psi should take no more than three minutes.

19. Question 19 of 25

    How long is the minimum classroom session in the Alberta Air Brake Program?

    • A1 hour
    • B40 hours
    • C3 hours
    • D6.5 hours
    Show answer

    Answer: D. 6.5 hours

    The classroom session is at least 6.5 hours.

20. Question 20 of 25

    Why should you not pump air brakes during a normal stop?

    • APumping wastes air and lowers system pressure
    • BIt is the only way to stop
    • CIt locks the steering
    • DIt makes the brakes too hot to touch
    Show answer

    Answer: A. Pumping wastes air and lowers system pressure

    Apply steady pressure and ease off as you slow. Pumping uses up air.

21. Question 21 of 25

    Do you need a road test to get the Q endorsement?

    • ANo
    • BYes, in a tractor-trailer
    • COnly if you are under 21
    • DYes, in a bus
    Show answer

    Answer: A. No

    A practical road test is not required for the air brake endorsement.

22. Question 22 of 25

    Which colour is usually used for the emergency (supply) air line between tractor and trailer?

    • ARed
    • BYellow
    • CBlue
    • DGreen
    Show answer

    Answer: A. Red

    The emergency or supply line is usually red and the service line is blue.

23. Question 23 of 25

    What happens in the practical training part of the program?

    • AYou take apart and rebuild a spring brake chamber
    • BYou drive an air-brake truck on a highway for an hour
    • CYou watch an air brake video at home and sign a form
    • DA 15-minute demonstration, then you practise the pre-trip twice
    Show answer

    Answer: D. A 15-minute demonstration, then you practise the pre-trip twice

    Practical training is a 15-minute demonstration followed by two practice pre-trip inspections.

24. Question 24 of 25

    How should you park an air-brake vehicle?

    • AApply the spring (parking) brakes
    • BPut a brick on the brake pedal
    • CHold the service brakes with the trailer hand valve
    • DLeave it in gear only
    Show answer

    Answer: A. Apply the spring (parking) brakes

    Use the spring brakes to park. Service brakes rely on air, which can leak away.

25. Question 25 of 25

    You fail the air brake knowledge test. When can you try again?

    • ARight away, the same day
    • BOnly after repeating the whole course
    • COn a different day
    • DAfter 6 months
    Show answer

    Answer: C. On a different day

    Retests must be taken on a different day.

Keyboard: 1–4 to answer, Enter for the next question.

The real test: 25 of 30; the test stops after 6 wrong answers