Ontario Air Brake (Z) Practice Test 1

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. What does a slack adjuster do?

   1. Measures the pushrod stroke for you
   2. Controls when the compressor cuts in
   3. Drains moisture from the brake chamber
   4. Acts as a lever on the camshaft

2. What are the metal trailer air line couplers commonly called?

   1. Glad valves
   2. Kingpins
   3. Gladhands
   4. Clevis pins

3. When can you book the Z practical test?

   1. Only after one year of driving
   2. Before writing the knowledge test
   3. After passing the knowledge test
   4. Only with a Class A licence

4. In Ontario, do you need a Z endorsement to drive a truck with air-over-hydraulic brakes?

   1. No, only full air brakes need it
   2. Yes, it is required
   3. Only if the truck is over 11,000 kg
   4. Only when towing a trailer

5. What happens when you press the brake pedal harder?

   1. The spring brakes apply instead
   2. Higher air pressure reaches the brakes
   3. The compressor cuts out sooner
   4. Air is released from the chambers

6. You will test in an air-braked dump truck with no trailer system. Which version applies?

   1. A road test only
   2. Version 1
   3. Version 2
   4. Either, at your choice

7. What is the lowest actual cut-in pressure allowed?

   1. 100 psi (690 kPa)
   2. 55 psi (380 kPa)
   3. 60 psi (414 kPa)
   4. 80 psi (552 kPa)

8. An air line was repaired with a fitting not approved for air brakes. What is it?

   1. Acceptable for one trip only
   2. Acceptable if it does not leak
   3. Acceptable on trailer lines only
   4. A defect; it is not allowed

9. What does a pushrod stroke indicator show?

   1. The date of the last brake inspection
   2. Stroke is past the limit
   3. How much brake lining is left
   4. The chamber's current air pressure

10. To test the low-air warning, what pressure should you start above?

    1. 145 psi (1000 kPa)
    2. 60 psi (414 kPa)
    3. 90 psi (621 kPa)
    4. 55 psi (380 kPa)

11. Your truck has automatic slack adjusters. Must you still inspect brake adjustment?

    1. Only once a year
    2. No, they never go out of adjustment
    3. Yes, adjustment must still be checked
    4. Only on the trailer

12. What should a driver know about the spring brake control on a vehicle they have not driven before?

    1. Which type it is and how it works
    2. Only where the drain valve is
    3. Nothing; all valves work the same
    4. Only the colour of the knob

13. In cold weather, why is moisture in the air system dangerous?

    1. It can freeze and cause brake failure
    2. It thickens the brake fluid
    3. It makes the spring brakes release
    4. It raises the governor setting

14. How are spring brakes applied?

    1. By brake fluid from a master cylinder
    2. By air pushed into the service chamber
    3. By a spring when air leaves the chamber
    4. By the driver pulling a cable lever

15. Why might an older truck show lower governor settings than a new one?

    1. Cold weather lowers the settings over time
    2. Operating pressures have risen
    3. Old governors are always defective
    4. Older trucks use hydraulic governors

16. What is the risk with a spring brake priority trailer?

    1. It needs its own separate air compressor
    2. Its spring brakes can never be released
    3. It cannot be used in a double combination
    4. It can roll before service air is ready

17. Which list matches the parts of a wedge air brake?

    1. Camshafts, rollers, slack adjusters and pads
    2. Rotors, calipers, pads and chambers
    3. Rotors, wedges, rollers and anchor pins
    4. Drums, shoes, spiders, shields and chambers

18. Why might a driver not notice brakes that are slightly out of adjustment?

    1. Normal driving rarely needs full braking
    2. The ABS light hides the problem
    3. Out-of-adjustment brakes feel stronger
    4. Spring brakes cover the difference

19. If you double your speed, how much longer is your stopping distance?

    1. About four times longer
    2. About eight times longer
    3. About three times longer
    4. About twice as long

20. What does a driver's air brake component inspection mainly involve?

    1. Measuring each drum's inside diameter
    2. Removing wheels to see the shoes
    3. Looking at visible parts
    4. Taking the brake chambers apart

21. When is it safe to get under a vehicle during an inspection?

    1. Only if spring brakes or blocks hold it
    2. Only after the trailer has been uncoupled
    3. Whenever the engine has been shut off
    4. Whenever air pressure is above 90 psi

22. Which safety equipment may be needed while inspecting air brakes?

    1. A high-visibility vest only
    2. A respirator and ear plugs only
    3. Rubber gloves and an apron only
    4. Safety glasses, steel toes, bump cap

23. Anchor pins in an S-cam brake are used to do what?

    1. Hold the brake chamber to its bracket
    2. Join the pushrod to the slack adjuster
    3. Lock the drum to the axle
    4. Attach one end of each brake shoe

24. A disc brake on an air-braked truck uses which parts at the wheel?

    1. A rotor and a caliper with pads
    2. A drum and two curved shoes
    3. A wedge and two brake shoes
    4. A spider and an S-shaped cam

25. What is pushrod stroke?

    1. How long the compressor takes to cut out
    2. How far the shoes travel on release
    3. Distance the pushrod moves out
    4. How far the pedal moves when pressed