Chapter 12a: Checklists, Charts and Circuit Diagrams

The “Checklists” chapter in the Ontario air brake test is a vital component for anyone seeking air brake certification. This section emphasizes the importance of following systematic checklists during vehicle inspections and daily operations.

Ontario Air Brake Test - Chapter 12a: Checklists, Charts and Circuit Diagrams

1 / 30

Before testing the low-air warning device, what minimum system pressure is required?

At least 483 kPa (70 psi)

At least 621 kPa (90 psi)

At least 1034 kPa (150 psi)

At least 345 kPa (50 psi)

2 / 30

Which air-line condition is NOT acceptable?

Undamaged couplings

Properly tightened fittings

Manufacturer-approved fittings

Improper fittings used to connect or repair an air line

3 / 30

For the build‑up time test, between which two pressures is the time measured?

From 345 to 552 kPa (50 to 80 psi)

From 587 to 690 kPa (85 to 100 psi)

From 690 to 1034 kPa (100 to 150 psi)

From 276 to 483 kPa (40 to 70 psi)

4 / 30

When is the vehicle considered defective regarding the low‑air warning device?

If it activates when brakes are applied at high speed

If it activates along with turn signals

If it activates at 621 kPa (90 psi)

If it fails to activate or activates below 380 kPa (55 psi)

5 / 30

When testing air-pressure build‑up time with a trailer attached, what must be done first?

Apply the trailer spring brakes only

Ensure the trailer supply valve is open (pushed in)

Disconnect the trailer

Ensure the trailer supply valve is closed (pulled out)

6 / 30

Which condition of brake-shoe linings indicates a problem?

Proper drum contact

Cracked, loose, missing or contaminated brake lining

Clean, dry lining with even wear

Lining thickness equal to or greater than required

7 / 30

When observing air pressure during the air‑loss test, what must be disregarded?

The time taken for pressure to stabilize

Any gauge fluctuation under one kPa

Any rise in pressure

The initial pressure drop before pressure stabilizes

8 / 30

What statement about operating a defective vehicle is correct?

It is allowed if the driver is experienced

It is allowed if the vehicle is empty

It is illegal to operate or drive a defective vehicle

It is allowed if the trip is short

9 / 30

On a steering axle, which mismatch is specifically listed as a defect?

Mismatched hub caps

Mismatched wheel covers

Mismatched air brake chamber size

Mismatched tire brand

10 / 30

What additional step prepares the vehicle for a functional inspection?

Turn headlights on

Turn steering wheel fully left

Fully load the vehicle

Put wheel chocks or blocks in place

11 / 30

What is a defect involving the air-compressor drive belt?

Manufacturer-approved belt installed

Correctly tensioned belt

Loose, cut or frayed drive belt

Belt free from cracks and damage

12 / 30

What compressor cut‑out pressure makes the vehicle defective?

Any cut‑out pressure below 1034 kPa (150 psi)

Actual cut‑out pressure below 380 kPa (55 psi)

Actual cut‑out pressure above 690 kPa (100 psi)

Actual cut‑out pressure above 1000 kPa (145 psi)

13 / 30

During the air‑loss rate test, what should the driver do with the service brake pedal?

Press and hold the brake pedal in the fully applied position

Pump the brake pedal repeatedly

Do not touch the brake pedal

Apply the brake pedal lightly

14 / 30

Before timing air pressure build‑up, to what level must the pressure be reduced?

Below 690 kPa (100 psi)

Below 276 kPa (40 psi)

Below 345 kPa (50 psi)

Below 552 kPa (80 psi)

15 / 30

During a foundation brake inspection, which of the following is a defect?

Brake-shoe lining not contacting the brake drum

Clean and secure brake components

Shoe lining fully contacting the drum

Proper lining thickness

16 / 30

What is the legal requirement for drivers regarding defective vehicle conditions?

Only serious defects must be reported

Drivers may keep defects to themselves

Only mechanics may report defects

Drivers are required to report defective vehicle conditions

17 / 30

What is a defect when inspecting accessible air lines?

Correctly routed and secured lines

Lines free of abrasion

Audible air leak

Properly fitting, undamaged lines

18 / 30

When inspecting brake drums or rotors, what condition means the vehicle is defective?

Drum or rotor within wear limits

Clean, smooth braking surface

Drum or rotor securely mounted

Cracked or broken brake drum or rotor

19 / 30

How is the low‑air warning device tested?

Disconnect the warning circuit and observe silence

Pump the brakes with the engine off and key off

Press and release the brake pedal several times until the device activates

Hold the brake pedal down continuously for two minutes

20 / 30

What mounting condition of the air compressor is considered defective?

Compressor firmly bolted in place

Correct fasteners installed and tight

Brackets free from cracks and damage

Insecure air-compressor mounting, bracket or fastener

21 / 30

Which is a defect when inspecting air tanks?

Insecure mounting

Tanks firmly attached

No visible damage or corrosion

Properly positioned drain valves

22 / 30

When inspecting brake chambers at each wheel, what is considered a defect?

Properly sealed chambers

Correct mounting and no damage

Audible air leaks

Matching chamber sizes on the steering axle

23 / 30

Which action must be done first to prepare the vehicle for a mechanical inspection of the air brake system?

Release the spring brakes

Increase engine speed

Apply the spring brakes

Drain all air tanks

24 / 30

What additional safety step must be taken after applying the spring brakes for a mechanical inspection?

Turn off the ignition

Release the parking brake

Disconnect the battery

Put wheel chocks or blocks in place

25 / 30

When performing the air‑loss rate test, what must be done with the spring brakes?

Pump the spring brakes repeatedly

Disconnect the spring brake chambers

Ensure vehicle is secure and release the spring brakes

Apply and hold the spring brakes

26 / 30

What else must match on a steering axle to avoid a defect?

Slack-adjuster length

Wheel color

Tire tread pattern

Rim size

27 / 30

When testing air‑compressor governor settings, what signals compressor cut‑out?

Low‑air warning comes on

Air pressure ceases climbing (and air dryer purge)

Engine speed dropping

Brake lights illuminating

28 / 30

For the low‑air warning to activate properly, what must be true about the ignition key?

Key is “off”

Key is “on”

Key is in “accessory” position

Key is removed

29 / 30

What build‑up time indicates a defective vehicle?

Less than one minute to rise from 587 to 690 kPa (85 to 100 psi)

More than two minutes to rise from 587 to 690 kPa (85 to 100 psi)

Exactly thirty seconds to reach maximum pressure

More than one minute to rise from 690 to 1034 kPa (100 to 150 psi)

30 / 30

Before a functional inspection of air brake operation, what must be done?

Disconnect the trailer

Drain the air system

Apply the spring brakes

Release the spring brakes

Your score is

Checklists guide drivers through essential steps, such as checking air pressure, testing warning devices, examining brake adjustment, and identifying air leaks. Adhering to a checklist ensures no critical component is overlooked, promoting thorough inspections and overall road safety. Mastery of checklist procedures is not only crucial for passing the Ontario air brake test but also for maintaining consistent, safe vehicle performance in everyday driving conditions.