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Ontario Air Brake Z Test Practice Questions - Ontario Air Brake (Z Endorsement) Knowledge Test Exam
Practice mode
Question
1
of 25
QUESTION 1 / 25
In Ontario, when do you need a Z endorsement on your driver's licence?
Choose one answer below.
A
When driving a vehicle with an air brake or air-over-hydraulic brake system
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B
Only when towing two trailers
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C
Only when carrying dangerous goods
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D
Whenever a vehicle has ABS
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QUESTION 2 / 25
Who creates Ontario driver knowledge tests administered through DriveTest?
Choose one answer below.
A
Vehicle fleet owners
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B
Truck manufacturers
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C
Insurance companies
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D
The Ontario Ministry of Transportation (MTO)
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QUESTION 3 / 25
Which official Ontario source is named for Z endorsement study?
Choose one answer below.
A
A passenger-vehicle maintenance schedule
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B
An insurance claims guide
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C
The Official Air Brake Handbook
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D
A private truck repair manual
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QUESTION 4 / 25
What component produces compressed air for the brake system?
Choose one answer below.
A
The low-air warning light
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B
The air compressor
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C
The brake drum
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D
The slack adjuster
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QUESTION 5 / 25
What does the air compressor governor control?
Choose one answer below.
A
The compressor cut-in and cut-out pressures
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B
Brake lining thickness
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C
Trailer gladhand colour
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D
The vehicle gross weight rating
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QUESTION 6 / 25
What is the first tank that compressed air usually enters called?
Choose one answer below.
A
The spring brake chamber
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B
The trailer service line
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C
The brake drum reservoir
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D
The supply or wet tank
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QUESTION 7 / 25
Why must air tanks be drained regularly?
Choose one answer below.
A
To remove all air before each stop sign
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B
To disable spring brakes during parking
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C
To remove moisture and oil that can damage components or freeze
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D
To silence the warning device permanently
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QUESTION 8 / 25
What does an air dryer do?
Choose one answer below.
A
It eliminates tank draining forever
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B
It removes moisture from compressed air before it enters the supply tank
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C
It applies the spring brakes for parking
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D
It measures pushrod stroke
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QUESTION 9 / 25
What is the usual purpose of an alcohol evaporator in cold weather?
Choose one answer below.
A
To add alcohol vapor that helps prevent moisture from freezing
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B
To increase engine horsepower
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C
To lubricate brake linings
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D
To release spring brakes without air
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QUESTION 10 / 25
What do air pressure gauges normally show in a dual air brake system?
Choose one answer below.
A
Brake lining thickness
✓
B
Brake drum temperature
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C
Exact stopping distance
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D
Primary and secondary air-tank pressure
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QUESTION 11 / 25
What does a low air-pressure warning device do?
Choose one answer below.
A
Refills air tanks without the compressor
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B
Measures brake chamber diameter
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C
Warns the driver when air pressure is dangerously low
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D
Prevents the compressor from reaching cut-out
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QUESTION 12 / 25
Which brakes are used for normal stopping when the brake pedal is pressed?
Choose one answer below.
A
Trailer parking supports
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B
Service brakes
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C
Caged spring brakes
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D
Dead-end couplers
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QUESTION 13 / 25
What happens in a service brake chamber when the brake pedal is pressed?
Choose one answer below.
A
Air pressure moves the diaphragm and pushes the pushrod outward
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B
The supply tank drains completely
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C
The brake lining is automatically replaced
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D
The governor changes the vehicle rating
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QUESTION 14 / 25
What is pushrod stroke?
Choose one answer below.
A
The amount of fuel used while braking
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B
The distance from tractor to kingpin
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C
The delay in steering movement
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D
The distance the pushrod travels out of the brake chamber
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QUESTION 15 / 25
What are spring brakes mainly designed to provide?
Choose one answer below.
A
Air drying at cut-out
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B
Dashboard lighting only
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C
Parking and emergency braking
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D
Normal accelerator control
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QUESTION 16 / 25
How do spring brakes normally release?
Choose one answer below.
A
The ABS lamp turns off
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B
Air pressure compresses the spring in the spring brake chamber
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C
Brake shoes are removed from the drum
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D
The wet tank is fully drained
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QUESTION 17 / 25
What colour and shape is the usual spring brake control valve knob?
Choose one answer below.
A
Yellow and four-sided
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B
Blue and round
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C
Green and triangular
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D
Red and eight-sided
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QUESTION 18 / 25
What is the most common foundation brake type described for air-brake commercial vehicles?
Choose one answer below.
A
Bicycle rim brakes
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B
Magnetic rail brakes
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C
Cable-only parking brakes
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D
S-cam brakes
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QUESTION 19 / 25
In an S-cam brake, what does the S-shaped cam do?
Choose one answer below.
A
Turns the compressor on and off
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B
Prevents all brake heat
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C
Forces the brake shoes apart against the brake drum
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D
Drains the supply tank
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QUESTION 20 / 25
Which two trailer air lines connect a towing vehicle to a trailer brake system?
Choose one answer below.
A
Wet line and oil return line
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B
Supply line and service line
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C
Fuel line and coolant line
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D
ABS lamp line and horn line
✓
QUESTION 21 / 25
What are gladhands used for?
Choose one answer below.
A
Connecting trailer air lines between the towing vehicle and trailer
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B
Measuring brake lining thickness
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C
Holding the brake pedal down
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D
Setting governor cut-out pressure
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QUESTION 22 / 25
What colour is normally used for the trailer supply line coupler?
Choose one answer below.
A
Blue
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B
Yellow
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C
White
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D
Red
✓
QUESTION 23 / 25
What colour is normally used for the trailer service line coupler?
Choose one answer below.
A
Yellow
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B
Orange
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C
Blue
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D
Red
✓
QUESTION 24 / 25
What is brake fade?
Choose one answer below.
A
A required coupling step
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B
A reduction in brake effectiveness as components overheat
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C
The normal purge sound of an air dryer
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D
Painting the brake drums
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QUESTION 25 / 25
What is the purpose of ABS on an air-brake vehicle?
Choose one answer below.
A
To help prevent wheel lock and maintain steering control
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B
To cut stopping distance in half
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C
To replace daily adjustment checks
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D
To keep the compressor from cycling
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