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

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

Push rod

Slack adjuster

Mounting bolt

Diaphragm

2 / 30

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

Uses controlled braking to gain traction

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

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

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

3 / 30

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

Contained

Compressed

Canned

Caged

4 / 30

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

Warmer, less

Colder, less

Cleaner, less

More compressed, less

5 / 30

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

Diameter, friction

Strength, force

Thickness, heat

Width, friction

6 / 30

What is the best way to avoid major breakdowns?

Verifying the system is at full pressure

Watching the dash gauges

Preventative maintenance

Listening for audible air leaks

7 / 30

Friction produces what?

Air pressure

Heat

Convection

Lubrication

8 / 30

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

One

Two

Three

Four

9 / 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.

Reducing the braking effort to the front wheels

Discharging the application air near the brake chambers

10 / 30

What absorbs the heat produced by friction?

Treadle

Diaphragm

Metal brake drums

Brake lining

11 / 30

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

A compressor

Spring parking brake chambers

A foot valve

A governor

12 / 30

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

Decrease the vehicle weight

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

Gain a mechanical advantage

Increase stopping distance

13 / 30

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

Mechanical, heat

Friction, Heat

Motion, mechanical

Heat, mechanical

14 / 30

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

Two to four, 80-100

Three to five, 40-70

One, 100-120

Two, 80-100

15 / 30

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

Technician's

Owner's

Driver's

Mechanic's

16 / 30

What are the two most common slack adjuster problems?

Lining wear, excessive moisture

Oversize drums, internal contamination

Seized shoe anchors, lining wear

Excessive premature wear and internal contamination.

17 / 30

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

Trailer spring parking brake valve

Compressor

Relay valve

Front and rear service reservoirs

18 / 30

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

Slack adjuster

S-cam

Push rod

Clevis and pin

19 / 30

Braking distance is defined as:

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

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

20 / 30

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

Automatically exhausts moisture from the reservoir when required

Allows the air to flow in one direction only

Transmits force in an air brake system

Holds a supply of compressed air

21 / 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

Clevis, pin

Spring brakes, service brakes

Service brakes, mounting bolts

22 / 30

What does a kPa stand for?

Pressure per square inch

Kilogram

Kilometre

Kilopascal

23 / 30

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

ABS valves

Tooth wheel

Electronic control unit

Wheel sensor

24 / 30

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

Cages

Decompresses

Applies

Coils

25 / 30

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

Release the spring parking brake

Make full brake application

Disconnect control (service) line glad hand

Disconnect supply (emergency) line glad hand

26 / 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

Two

Eight

Ten

27 / 30

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

All of these

That the glad hands and the lines are secure

That the push rod travel is within limitations on all chambers

That the trailer supply valve is operating properly

28 / 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

All of these

Watching the gauges

Listening for warning signals

29 / 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

Brakes applied and released up to five times a second

Air from the trailer reservoir released to the brake chambers.

Engine power is reduced

30 / 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.

Brake fade

The brake drum to crack or warp.

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

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.