Air Brake Test Practice: Z Endorsement Ontario 2025

Air Brake Test Practice: Z Endorsement Ontario 2025: Try our free Air brake systems technical questions and answers for the Ontario Truck Driver Licence exam. There are a total of 50 multiple choice question answers regarding Air Brake knowledge test.

A practice test for the MTO’s “Z” endorsement for trailer air brake systems. ailer air brake systems. For those upgrading to a truck and trailer equipped with air brakes. Gain the knowledge necessary to operate brake systems safely and detect faults in these systems. Upon successful completion of the written test, participants will take the practical test

Air Brake Test Practice: Z Endorsement Ontario

After successful completion of both tests, you will receive the ‘Z’ endorsement from the Ministry of Transportation. Students must bring proof of (at least) a full ‘G’ license. Air Brakes are used on some medium‐duty and all heavy‐duty vehicles. The air braking system is basically a series of valves forcing compressed air through the system to generate a constant supply of air which is then used to apply the brakes.

Test type	AZ Practice Test Ontario 2025
Licence Type	Commercial Truck Driver
Class	Full G
Province	Ontario
Test type	Sample Practice Test
Total Questions	50 MCQs
Topics Covered	Air Brake Z Endorsement

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Air Brake Knowledge Test

1 / 31

How the normal pressure range of an air brake system is determined?

A) it is determined by the points where the air compressor is cut-out pressure and cut-in pressure

B) it is determined by the points where the air compressor is turned off and turned on

C) it is determined by the points where the air compressor is turned on and turned off

D) all of them

2 / 31

Which of the following brake system used the brake fluid?

A) Pedal brake systems

B) Hydraulic brake systems

C) Auto brake systems

D) Air brake systems

3 / 31

Which of the following component causes the compressor to stop pumping air and also cause the compressor to start pumping air again if required?

A) central governor

B) compressor monitor

C) air brake monitor

D) governor

4 / 31

Actual cut-in pressure must never be less than ____ psi?

A) 80 psi

B) 95 psi

C) 75 psi

D) 70 psi

5 / 31

Which of the following brake system used compressed air?

A) Air brake systems

B) Cool brake systems

C) Air padal brake systems

D) Hydraulic brake systems

6 / 31

Which of the following prevents over-pressure of the air brake system?

A) Air dryer

B) Safety valves

C) Air pressure

D) Alcohol evaporator

7 / 31

How do you prevent too much moisture and oil from collecting?

A) the primary and secondary tanks must be drained regularly

B) the safety valves must be drained regularly

C) the air dryer must be drained regularly

D) the air tanks must be drained regularly

8 / 31

Why Spring brakes are designed?

A) all of them

B) on an emergency to stop your vehicle

C) when you are parking your vehicle

D) when your service brakes fail

9 / 31

Which of the following brake is called service brakes?

A) brakes that are used for normal stopping

B) all of them

C) brakes that are used for emergency braking

D) brakes that are used for parking

10 / 31

Which of the following method may use by a technician to temporarily disable a spring brake chamber when it is fail?

A) all of them

B) manual caging method

C) caging bolt method

D) spring in spring brake method

11 / 31

Brakes convert the _____ of a moving vehicle into heat.

A) hydraulic

B) all of them

C) energy

D) air

12 / 31

Safety valves normally open at ____ psi.

A) 155 psi

B) 140 psi

C) 150 psi

D) 145 psi

13 / 31

Which of the following problems can occur if the mixture of moisture and oil that collects in the supply tank passes into the rest of the air brake system?

A) Moisture in the brake system can freeze in cold temperatures and may cause brake failure.

B) Too much moisture and oil collecting in the Air-tanks can reduce the volume of air and may cause brake failure.

C) The mixture of moisture and oil can become corrosive and damage the Air-tank and other system components.

D) all of them

14 / 31

What is the function of an Alcohol evaporator?

A) it cools the moisture and passes through a drying material

B) it collect less moisture than the supply or “wet” tank.

C) if one circuit fails, the other circuit will provide enough brake function to stop the vehicle

D) it reduce the tendency of moisture in the air brake system can freeze

15 / 31

What is the normal air brake system pressure range?

A) around 110 to 125 psi

B) around 95 to 115 psi

C) around 100 to 120 psi

D) around 90 to 110 psi

16 / 31

Which of the following chamber contains a flexible rubber disc called a diaphragm?

A) spring brake chambers

B) air brake chamber

C) service brake chamber

D) hydro brake chambers

17 / 31

Air pressure is usually measured in ______

A) kiloPascals (kPa) or pounds per square inch (psi)

B) air per square inch (asi)

C) kiloPascals (kPa)

D) pounds per square inch (psi)

18 / 31

Actual cut-out pressure must never be higher than _____ psi?

A) 115 psi

B) 155 psi

C) 145 psi

D) 125 psi

19 / 31

Which of the following tank uses two circuits system? (two circuits are referred to as the primary circuit and the secondary circuit.)

A) Dual-service tanks

B) Two way check valve

C) Dual-Air dryer

D) Dual Air-tank drain valve

20 / 31

What do you mean by low air-pressure warning?

A) all of them

B) means there is a minor air brake system safety hazard

C) means there is a serious air brake system safety hazard

D) means air brake system is failed

21 / 31

What is the function of an air pressure gauge?

A) let you know how much air pressure is in the primary tanks

B) let you know how much air pressure is in the secondary tanks

C) let you know how much air pressure is in the air brake system

D) All of them

22 / 31

Which of the following major brake types are used in air brake systems?

A) Hydraulic brake

B) Engine brake

C) drum/disc brakes

D) Pedal brake

23 / 31

How does a break work to stop a moving vehicle?

A) the brake drums exert pressure on the brake pads

B) the brake shoes exert pressure on the brake drums

C) the brake shoes exert pressure on the brake pads

D) the brake rotors exert pressure on the brake drums

24 / 31

Which of the following removes moisture from the air brake system?

A) air dryer

B) safety valves

C) alcohol evaporator

D) air pressure gauges

25 / 31

During a trip, you have noticed that the brakes overheat due to overuse or improper adjustment. What you must do?

A) all of them

B) stop and allow them to cool before proceeding

C) use engine brake instated of paddle brake

D) do not press the brake harder

26 / 31

What is the minimum air pressure that must be supplied to the spring brake chamber to compress or “cage” the spring to release the spring brakes?

A) 40 psi

B) 50 psi

C) 60 psi

D) 30 psi

27 / 31

When application pressure increases from ____ psi to ____psi, the stroke increases noticeably.

A) 5 psi to 50 psi

B) 6 psi to 60 psi

C) 10 psi to 80 psi

D) 8 psi to 80 psi

28 / 31

To drive a vehicle with ________ braking systems in Ontario, you must have an air brake endorsement on your driver’s licence,

A) Air-over-hydraulic brakes

B) Air brake systems

C) Hydraulic brake systems

D) Air parking brakes

29 / 31

Where the air dryer is located?

A) between the primary and the supply tank

B) between the primary and secondary tanks

C) between the supply tank and the air compressor

D) between the air compressor and the supply tank

30 / 31

Which of the following braking systems are used on most large commercial vehicles?

A) Air brake systems

B) Air-over-hydraulic brakes

C) Air parking brakes

D) Hydraulic brake systems

31 / 31

What is compressed air?

A) form of stored cool air

B) form of stored compressed air

C) form of stored energy

D) form of stored air

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