Ontario Air Brake (Z) Practice Test 4

All 25 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

1. To find the right adjustment limit for a chamber, what must you identify?

   1. The axle weight rating
   2. Its style, type and size
   3. The compressor model
   4. Its colour and age

2. Which statement about driving with a known brake defect is correct?

   1. It is legal if you report it afterwards
   2. It is illegal to operate the vehicle
   3. It is legal if the ABS still works
   4. It is legal for short trips under 10 km

3. Is the engine running or off while you hold the brakes applied to measure stroke?

   1. Running at 1,200 rpm
   2. Running at idle
   3. Off
   4. Running only for the trailer

4. A spring-priority trailer loses its service brake air. How can you brake the trailer?

   1. Push the blue tractor knob
   2. Press the pedal harder
   3. Close the trailer supply valve
   4. Pull the trailer hand valve

5. How should you secure the vehicle before the system operation tests?

   1. Any surface, as long as the ABS is on
   2. A downhill slope with the engine idling
   3. Trailer hand valve applied and nothing else
   4. Level ground, spring brakes on, chocks

6. Air-over-hydraulic brakes are found mainly on which vehicles?

   1. Highway tractor-trailers only
   2. Motorcycles and mopeds
   3. Passenger cars and vans
   4. Medium-duty commercial vehicles

7. Why should you never try to repair a spring brake chamber yourself?

   1. It would void the vehicle's CVOR
   2. It is filled with corrosive fluid
   3. It is welded shut and cannot be opened
   4. Its spring can release violently

8. How does pushrod stroke stop the wheel on an air disc brake?

   1. It spreads shoes inside a drum
   2. It drives a wedge between shoes
   3. It turns an S-cam against rollers
   4. It presses the pads against the rotor

9. Before you measure anything on a brake assembly, how should it feel?

   1. Hot, right after a hard stop
   2. Warm, so parts are expanded
   3. Damp, after draining the tanks
   4. Cool to the touch

10. What does a front wheel-limiting valve do?

    1. Reduces service brake force on the steering axle
    2. Limits how far the steering wheel turns
    3. Stops the front wheels from turning when parked
    4. Holds the front brakes on during a skid

11. The ABS malfunction lamp comes on. What braking do you still have?

    1. Regular brake function
    2. No service brakes at all
    3. Spring brakes only
    4. Trailer brakes only

12. How far above cut-in pressure is cut-out pressure normally set?

    1. 5 to 10 psi higher
    2. 40 to 50 psi higher
    3. 60 to 70 psi higher
    4. 20 to 25 psi higher

13. Can one vehicle use more than one type of foundation brake?

    1. Only on trailers, never on the tractor
    2. Yes, designs can be mixed on one vehicle
    3. No, all axles must use the same type
    4. Only if all of them are self-adjusting

14. How often does Ontario law require air brake adjustment to be checked?

    1. Once a week
    2. Only at the annual inspection
    3. At least once each day
    4. Once a month

15. Why should the engine be off for most air brake inspections?

    1. The compressor overheats if running
    2. The gauges only work with it off
    3. Air pressure is higher with it off
    4. Moving engine parts are a hazard

16. Which sign tells you the compressor has cut in?

    1. The low-air warning light comes on
    2. The yellow spring brake knob pops out
    3. Pressure starts to rise again
    4. The air dryer purges loudly

17. A commercial licence holder renews a Z endorsement. Which in-person tests are also needed?

    1. Vision and commercial knowledge
    2. A full road test every single time
    3. No tests at all, only the module
    4. A medical exam done at DriveTest

18. Can you rely on hose colours to identify air lines on every vehicle?

    1. Yes, but only on trailers
    2. No, older vehicles may not follow the code
    3. Yes, all vehicles use one colour code
    4. No, colours are never used

19. About how much air pressure is normally needed to hold spring brakes released?

    1. 20 psi (138 kPa)
    2. 100 psi (690 kPa)
    3. 150 psi (1035 kPa)
    4. 60 psi (414 kPa)

20. What controls the tractor protection valve?

    1. The foot valve only
    2. The governor
    3. The spring brake control valve
    4. The trailer supply valve

21. What is a typical normal operating range for an air brake system?

    1. About 60 to 80 psi
    2. About 150 to 170 psi
    3. About 40 to 60 psi
    4. About 100 to 120 psi

22. How is the size of an air brake chamber defined?

    1. Diaphragm area in square inches
    2. The weight of the empty chamber
    3. The pushrod length in inches
    4. The diameter of the air line

23. How do you check that an air tank is secure?

    1. Drain it and weigh the water
    2. Check its paint for cracks
    3. Tap it and listen for echoes
    4. Look at it and try to move it

24. Is it legal to drive with one brake out of adjustment if the others are fine?

    1. Yes, until the next annual
    2. Yes, on the trailer only
    3. No, it is prohibited
    4. Yes, below 80 km/h

25. What are the two ways to earn a Z endorsement in Ontario?

    1. An approved course, or DriveTest tests
    2. A mechanic's licence, or a fee
    3. An online video, or a road test
    4. A medical report, or a trainer's letter