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

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

Spring parking brake chambers

A foot valve

A governor

A compressor

2 / 30

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

Coils

Applies

Decompresses

Cages

3 / 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.

Two

Ten

Four

Eight

4 / 30

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

Electronic control unit

ABS valves

Wheel sensor

Tooth wheel

5 / 30

What does a kPa stand for?

Kilogram

Kilopascal

Kilometre

Pressure per square inch

6 / 30

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

Compressor

Relay valve

Trailer spring parking brake valve

Front and rear service reservoirs

7 / 30

What are the two most common slack adjuster problems?

Oversize drums, internal contamination

Lining wear, excessive moisture

Seized shoe anchors, lining wear

Excessive premature wear and internal contamination.

8 / 30

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

Discharging the application air near the brake chambers

Release the brakes quicker when a brake application is released.

Reducing the braking effort to the front wheels

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

9 / 30

Braking distance is defined as:

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

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

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

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

10 / 30

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

That the trailer supply valve is operating properly

That the push rod travel is within limitations on all chambers

That the glad hands and the lines are secure

All of these

11 / 30

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

Causes the limiting valve to operate

Air from the trailer reservoir released to the brake chambers.

Engine power is reduced

Brakes applied and released up to five times a second

12 / 30

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

Colder, less

More compressed, less

Cleaner, less

Warmer, less

13 / 30

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

Holds a supply of compressed air

Automatically exhausts moisture from the reservoir when required

Transmits force in an air brake system

Allows the air to flow in one direction only

14 / 30

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

Diameter, friction

Width, friction

Thickness, heat

Strength, force

15 / 30

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

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

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

Uses controlled braking to gain traction

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

16 / 30

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

Mounting bolt

Diaphragm

Slack adjuster

Push rod

17 / 30

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

Mechanical, heat

Motion, mechanical

Friction, Heat

Heat, mechanical

18 / 30

Friction produces what?

Lubrication

Heat

Air pressure

Convection

19 / 30

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

Disconnect supply (emergency) line glad hand

Make full brake application

Release the spring parking brake

Disconnect control (service) line glad hand

20 / 30

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

The brake drum to crack or warp.

Brake fade

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

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

21 / 30

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

Caged

Contained

Compressed

Canned

22 / 30

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

Increase stopping distance

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

Gain a mechanical advantage

Decrease the vehicle weight

23 / 30

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

One

Two

Four

Three

24 / 30

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

Feeling the brake response of the vehicle

Watching the gauges

All of these

Listening for warning signals

25 / 30

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

S-cam

Clevis and pin

Slack adjuster

Push rod

26 / 30

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

Two, 80-100

Three to five, 40-70

One, 100-120

Two to four, 80-100

27 / 30

What absorbs the heat produced by friction?

Diaphragm

Metal brake drums

Treadle

Brake lining

28 / 30

What is the best way to avoid major breakdowns?

Listening for audible air leaks

Watching the dash gauges

Verifying the system is at full pressure

Preventative maintenance

29 / 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

Service brakes, mounting bolts

Spring brakes, service brakes

Clevis, pin

30 / 30

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

Mechanic's

Owner's

Technician's

Driver's

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.