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

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

Pump the spring brakes repeatedly

Ensure vehicle is secure and release the spring brakes

Apply and hold the spring brakes

Disconnect the spring brake chambers

2 / 30

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

From 690 to 1034 kPa (100 to 150 psi)

From 276 to 483 kPa (40 to 70 psi)

From 345 to 552 kPa (50 to 80 psi)

From 587 to 690 kPa (85 to 100 psi)

3 / 30

What is a defect when inspecting accessible air lines?

Lines free of abrasion

Properly fitting, undamaged lines

Correctly routed and secured lines

Audible air leak

4 / 30

What mounting condition of the air compressor is considered defective?

Insecure air-compressor mounting, bracket or fastener

Brackets free from cracks and damage

Correct fasteners installed and tight

Compressor firmly bolted in place

5 / 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)

6 / 30

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

Matching chamber sizes on the steering axle

Correct mounting and no damage

Properly sealed chambers

Audible air leaks

7 / 30

How is the low‑air warning device tested?

Hold the brake pedal down continuously for two minutes

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

Pump the brakes with the engine off and key off

Disconnect the warning circuit and observe silence

8 / 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 fails to activate or activates below 380 kPa (55 psi)

If it activates at 621 kPa (90 psi)

If it activates along with turn signals

9 / 30

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

Manufacturer-approved belt installed

Belt free from cracks and damage

Loose, cut or frayed drive belt

Correctly tensioned belt

10 / 30

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

Disconnect the trailer

Apply the spring brakes

Release the spring brakes

Drain the air system

11 / 30

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

Apply the spring brakes

Increase engine speed

Release the spring brakes

Drain all air tanks

12 / 30

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

Low‑air warning comes on

Engine speed dropping

Brake lights illuminating

Air pressure ceases climbing (and air dryer purge)

13 / 30

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

Pump the brake pedal repeatedly

Apply the brake pedal lightly

Do not touch the brake pedal

Press and hold the brake pedal in the fully applied position

14 / 30

What build‑up time indicates a defective vehicle?

Exactly thirty seconds to reach maximum pressure

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)

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

15 / 30

Which air-line condition is NOT acceptable?

Properly tightened fittings

Improper fittings used to connect or repair an air line

Manufacturer-approved fittings

Undamaged couplings

16 / 30

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

The initial pressure drop before pressure stabilizes

Any rise in pressure

Any gauge fluctuation under one kPa

The time taken for pressure to stabilize

17 / 30

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

Below 552 kPa (80 psi)

Below 690 kPa (100 psi)

Below 276 kPa (40 psi)

Below 345 kPa (50 psi)

18 / 30

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

Brake-shoe lining not contacting the brake drum

Proper lining thickness

Clean and secure brake components

Shoe lining fully contacting the drum

19 / 30

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

Put wheel chocks or blocks in place

Disconnect the battery

Turn off the ignition

Release the parking brake

20 / 30

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

Drum or rotor within wear limits

Drum or rotor securely mounted

Clean, smooth braking surface

Cracked or broken brake drum or rotor

21 / 30

What additional step prepares the vehicle for a functional inspection?

Turn steering wheel fully left

Put wheel chocks or blocks in place

Turn headlights on

Fully load the vehicle

22 / 30

Which condition of brake-shoe linings indicates a problem?

Proper drum contact

Lining thickness equal to or greater than required

Cracked, loose, missing or contaminated brake lining

Clean, dry lining with even wear

23 / 30

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

Only mechanics may report defects

Drivers may keep defects to themselves

Only serious defects must be reported

Drivers are required to report defective vehicle conditions

24 / 30

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

Key is removed

Key is “off”

Key is in “accessory” position

Key is “on”

25 / 30

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

Mismatched hub caps

Mismatched air brake chamber size

Mismatched tire brand

Mismatched wheel covers

26 / 30

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

Ensure the trailer supply valve is closed (pulled out)

Ensure the trailer supply valve is open (pushed in)

Apply the trailer spring brakes only

Disconnect the trailer

27 / 30

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

Tire tread pattern

Slack-adjuster length

Wheel color

Rim size

28 / 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 1000 kPa (145 psi)

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

29 / 30

What statement about operating a defective vehicle is correct?

It is illegal to operate or drive a defective vehicle

It is allowed if the trip is short

It is allowed if the driver is experienced

It is allowed if the vehicle is empty

30 / 30

Which is a defect when inspecting air tanks?

No visible damage or corrosion

Tanks firmly attached

Properly positioned drain valves

Insecure mounting

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.