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

What is a defect when inspecting accessible air lines?

Audible air leak

Correctly routed and secured lines

Lines free of abrasion

Properly fitting, undamaged lines

2 / 30

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

Key is in “accessory” position

Key is removed

Key is “off”

Key is “on”

3 / 30

Which is a defect when inspecting air tanks?

No visible damage or corrosion

Insecure mounting

Properly positioned drain valves

Tanks firmly attached

4 / 30

What mounting condition of the air compressor is considered defective?

Correct fasteners installed and tight

Compressor firmly bolted in place

Insecure air-compressor mounting, bracket or fastener

Brackets free from cracks and damage

5 / 30

Which condition of brake-shoe linings indicates a problem?

Lining thickness equal to or greater than required

Clean, dry lining with even wear

Cracked, loose, missing or contaminated brake lining

Proper drum contact

6 / 30

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

Drivers are required to report defective vehicle conditions

Only mechanics may report defects

Drivers may keep defects to themselves

Only serious defects must be reported

7 / 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

8 / 30

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

Mismatched hub caps

Mismatched tire brand

Mismatched wheel covers

Mismatched air brake chamber size

9 / 30

What build‑up time indicates a defective vehicle?

Exactly thirty seconds to reach maximum pressure

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)

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

10 / 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

11 / 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)

Disconnect the trailer

Apply the trailer spring brakes only

Ensure the trailer supply valve is open (pushed in)

12 / 30

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

Cracked or broken brake drum or rotor

Clean, smooth braking surface

Drum or rotor within wear limits

Drum or rotor securely mounted

13 / 30

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

Release the parking brake

Turn off the ignition

Disconnect the battery

Put wheel chocks or blocks in place

14 / 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

15 / 30

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

Ensure vehicle is secure and release the spring brakes

Disconnect the spring brake chambers

Apply and hold the spring brakes

Pump the spring brakes repeatedly

16 / 30

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

From 276 to 483 kPa (40 to 70 psi)

From 587 to 690 kPa (85 to 100 psi)

From 345 to 552 kPa (50 to 80 psi)

From 690 to 1034 kPa (100 to 150 psi)

17 / 30

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

Any gauge fluctuation under one kPa

Any rise in pressure

The time taken for pressure to stabilize

The initial pressure drop before pressure stabilizes

18 / 30

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

Tire tread pattern

Slack-adjuster length

Wheel color

Rim size

19 / 30

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

Below 345 kPa (50 psi)

Below 690 kPa (100 psi)

Below 276 kPa (40 psi)

Below 552 kPa (80 psi)

20 / 30

How is the low‑air warning device tested?

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

Disconnect the warning circuit and observe silence

21 / 30

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

Drain the air system

Disconnect the trailer

Apply the spring brakes

Release the spring brakes

22 / 30

What statement about operating a defective vehicle is correct?

It is allowed if the vehicle is empty

It is allowed if the trip is short

It is allowed if the driver is experienced

It is illegal to operate or drive a defective vehicle

23 / 30

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

Loose, cut or frayed drive belt

Correctly tensioned belt

Belt free from cracks and damage

Manufacturer-approved belt installed

24 / 30

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

At least 1034 kPa (150 psi)

At least 345 kPa (50 psi)

At least 621 kPa (90 psi)

At least 483 kPa (70 psi)

25 / 30

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

Brake lights illuminating

Engine speed dropping

Air pressure ceases climbing (and air dryer purge)

Low‑air warning comes on

26 / 30

Which air-line condition is NOT acceptable?

Properly tightened fittings

Manufacturer-approved fittings

Undamaged couplings

Improper fittings used to connect or repair an air line

27 / 30

What additional step prepares the vehicle for a functional inspection?

Fully load the vehicle

Turn steering wheel fully left

Turn headlights on

Put wheel chocks or blocks in place

28 / 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 at 621 kPa (90 psi)

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

If it activates along with turn signals

29 / 30

What compressor cut‑out pressure makes the vehicle defective?

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

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

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

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

30 / 30

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

Increase engine speed

Release the spring brakes

Drain all air tanks

Apply 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.