NEW BRUNSWICK AIR BRAKE TEST 04

Air brakes are an essential part of any commercial vehicle’s braking system, and New Brunswick, Canada has strict rules and regulations when it comes to air brake testing.

Air Brake Test 04

1 / 30

What does a kPa stand for?

Kilopascal

Kilogram

Pressure per square inch

Kilometre

2 / 30

On spring brake systems, during full brake application, compounding of the force applied on the slack adjusters and linkage can be said to be a combination of two forces: the force applied by the _________ and the _________.

Spring brakes, compressor

Spring brakes, service brakes

Clevis, pin

Service brakes, mounting bolts

3 / 30

The ________ the air supply is kept, the ______ chance of brake problems.

More compressed, less

Warmer, less

Colder, less

Cleaner, less

4 / 30

What is the function of a 'spitter' valve on a reservoir?

Automatically exhausts moisture from the reservoir when required

Transmits force in an air brake system

Holds a supply of compressed air

Allows the air to flow in one direction only

5 / 30

The electronic engine control is activated automatically by the ATC if all the wheels begin to slip. What effect does this have?

Brakes applied and released up to five times a second

Engine power is reduced

Causes the limiting valve to operate

Air from the trailer reservoir released to the brake chambers.

6 / 30

What is the best way to avoid major breakdowns?

Preventative maintenance

Listening for audible air leaks

Verifying the system is at full pressure

Watching the dash gauges

7 / 30

The _______ adjusts the free play in the linkage between the push rod and the brake shoes.

Slack adjuster

Push rod

S-cam

Clevis and pin

8 / 30

On spring operated parking brakes, during normal operation, air pressure _________ the spring, holding it ready for parking or emergency braking.

Coils

Applies

Cages

Decompresses

9 / 30

Friction produces what?

Air pressure

Lubrication

Convection

Heat

10 / 30

Which of the following is NOT a component of a spring parking brake system?

Compressor

Relay valve

Front and rear service reservoirs

Trailer spring parking brake valve

11 / 30

Normally on an S-cam brake with automatic slack adjustment, ________ brake applications of ________ psi per day will keep the brakes properly adjusted.

Three to five, 40-70

Two to four, 80-100

Two, 80-100

One, 100-120

12 / 30

On a combination vehicle, what is the first step in a tractor protection valve check?

Disconnect control (service) line glad hand

Make full brake application

Disconnect supply (emergency) line glad hand

Release the spring parking brake

13 / 30

A relay valve has two uses. Which of the following is one of them?

Connecting the control (service) and supply (emergency) lines of the trailer to the tractor

Release the brakes quicker when a brake application is released.

Discharging the application air near the brake chambers

Reducing the braking effort to the front wheels

14 / 30

What is a reason a medium sized vehicle would use air over hydraulic brakes?

Increase stopping distance

Gain a mechanical advantage

Decrease the vehicle weight

It gives the option of pulling an air brake equipped trailer.

15 / 30

Which of the following is NOT true about automatic traction control?

The system uses two functions: differential braking and electronic engine control

Improves the ability of the driver to manoeuvre the vehicle on slippery surfaces

Uses controlled braking to gain traction

Monitors wheel speed at all times and controls wheel speed while braking

16 / 30

What will a tractor protection valve with a broken return spring cause?

Loss of air during normal brake applications if operating the tractor without a trailer.

The brake drum to crack or warp.

An emergency brake application on the trailer until a brake application was made

Brake fade

17 / 30

What absorbs the heat produced by friction?

Treadle

Brake lining

Metal brake drums

Diaphragm

18 / 30

Which of the following is considered the 'brain' of an anti-lock braking system?

Electronic control unit

Tooth wheel

ABS valves

Wheel sensor

19 / 30

Ultimately, it is the _______ responsibility to ensure that brakes are adjusted correctly.

Driver's

Owner's

Technician's

Mechanic's

20 / 30

A vehicle carrying a load of 20,000 kg at 20 km/h is brought to a stop in 45 metres with normal application of the brakes. If this same vehicle carried 40,000 kg at 40 km/h, it would require ____ times the braking force to stop the vehicle in 45 metres.

Four

Ten

Eight

Two

21 / 30

Braking distance is defined as:

The time it takes the air to travel through a properly maintained air brake system

A combination of driver's reaction time, brake lag, and stopping distance

The time it takes from the moment a hazard is recognized to the time the brake is applied,

The actual distance the vehicle travels after the brake is applied until the vehicle stops

22 / 30

What methods can the driver use to stay aware of the condition of the vehicle's braking system?

All of these

Listening for warning signals

Feeling the brake response of the vehicle

Watching the gauges

23 / 30

What are the two most common slack adjuster problems?

Excessive premature wear and internal contamination.

Lining wear, excessive moisture

Seized shoe anchors, lining wear

Oversize drums, internal contamination

24 / 30

The ________ of the drum brakes determines the amount of _____ they are able to absorb and dissipate into the atmosphere.

Diameter, friction

Strength, force

Width, friction

Thickness, heat

25 / 30

Which of the following is NOT a component of an air brake system?

A governor

Spring parking brake chambers

A compressor

A foot valve

26 / 30

For a vehicle to move along the highway, an internal combustion engine must convert its _____ energy into ______ energy.

Motion, mechanical

Friction, Heat

Mechanical, heat

Heat, mechanical

27 / 30

The amount of force available at the push rod is consistent out to ____ inches of stroke.

Three

Four

Two

One

28 / 30

A brake chamber is a circular container divided in the middle by a flexible ________.

Push rod

Diaphragm

Mounting bolt

Slack adjuster

29 / 30

At a truck stop before a downgrade, what needs to be checked before continuing to drive?

That the push rod travel is within limitations on all chambers

That the glad hands and the lines are secure

All of these

That the trailer supply valve is operating properly

30 / 30

Air that is squeezed into a much smaller space than it normally would occupy is said to be ________.

Compressed

Caged

Canned

Contained

Your score is

The province annually conducts air brake tests on commercial vehicles to ensure their safety on the road. These tests are thorough and cover several aspects of the brake system, including the air compressor, valves, hoses, and reservoirs. Furthermore, the province has strict regulations about who can operate a vehicle with air brakes – only those who have completed the necessary training and obtained an air brake endorsement can operate these vehicles. These measures ensure that the people of New Brunswick can travel safely on the province’s roads, knowing that every commercial vehicle with air brakes has been thoroughly tested and maintained.

Before learning to drive a Class 1, Class 2, Class 3, or Class 4 vehicle, you must get authorized instruction in the class of vehicle you want to be licensed in. For each section of these practice tests, we have multiple practice tests. Requirements for Air Brake Endorsement are 1) Must complete an Air Brake Written Test 2) Must complete an Air Brake Practical Test.

To successfully prepare, consider utilizing these exams and the official New Brunswick Air Brake Manual to your advantage. The more knowledge you can attain, the better it will be for you once you return to the SNB office to take the air brake license written knowledge test.