MANITOBA AIR BRAKE PRACTICE TEST 04

Air brakes are an essential component of any commercial vehicle operating in Manitoba, Canada. These brakes operate using compressed air to apply pressure to the brake pads, thus bringing the vehicle to a stop.

Air Brake Test 04

1 / 30

What absorbs the heat produced by friction?

Brake lining

Metal brake drums

Treadle

Diaphragm

2 / 30

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

Diaphragm

Push rod

Mounting bolt

Slack adjuster

3 / 30

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

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.

The brake drum to crack or warp.

4 / 30

Friction produces what?

Heat

Lubrication

Air pressure

Convection

5 / 30

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

Caged

Contained

Canned

Compressed

6 / 30

What is the best way to avoid major breakdowns?

Preventative maintenance

Listening for audible air leaks

Watching the dash gauges

Verifying the system is at full pressure

7 / 30

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

Clevis and pin

S-cam

Slack adjuster

Push rod

8 / 30

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

Friction, Heat

Mechanical, heat

Motion, mechanical

Heat, mechanical

9 / 30

What are the two most common slack adjuster problems?

Oversize drums, internal contamination

Excessive premature wear and internal contamination.

Seized shoe anchors, lining wear

Lining wear, excessive moisture

10 / 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

Two to four, 80-100

One, 100-120

11 / 30

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

Release the spring parking brake

Disconnect control (service) line glad hand

Make full brake application

Disconnect supply (emergency) line glad hand

12 / 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

Eight

Four

Ten

13 / 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

That the trailer supply valve is operating properly

All of these

14 / 30

What does a kPa stand for?

Kilometre

Kilopascal

Pressure per square inch

Kilogram

15 / 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

16 / 30

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

Electronic control unit

ABS valves

Wheel sensor

Tooth wheel

17 / 30

Braking distance is defined as:

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

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

18 / 30

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

A foot valve

Spring parking brake chambers

A governor

A compressor

19 / 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 _________.

Clevis, pin

Spring brakes, service brakes

Spring brakes, compressor

Service brakes, mounting bolts

20 / 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

Air from the trailer reservoir released to the brake chambers.

Engine power is reduced

Causes the limiting valve to operate

21 / 30

Which of the following is NOT true about automatic traction 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

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

22 / 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

Reducing the braking effort to the front wheels

Release the brakes quicker when a brake application is released.

Discharging the application air near the brake chambers

23 / 30

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

Mechanic's

Driver's

Owner's

Technician's

24 / 30

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

Width, friction

Diameter, friction

Thickness, heat

Strength, force

25 / 30

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

Compressor

Trailer spring parking brake valve

Relay valve

Front and rear service reservoirs

26 / 30

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

Warmer, less

Cleaner, less

More compressed, less

Colder, less

27 / 30

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

One

Two

Four

Three

28 / 30

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

Decompresses

Applies

Coils

Cages

29 / 30

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

Gain a mechanical advantage

Decrease the vehicle weight

Increase stopping distance

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

30 / 30

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

Allows the air to flow in one direction only

Transmits force in an air brake system

Automatically exhausts moisture from the reservoir when required

Holds a supply of compressed air

Your score is

In Manitoba, drivers must pass an air brake test before obtaining a commercial driver’s license. This test ensures that drivers understand how to properly operate and maintain air brake systems, which is crucial for their safety and the safety of others on the road. Additionally, Manitoba requires annual air brake inspections to ensure all commercial vehicles have functioning air brakes. These inspections help prevent accidents caused by faulty braking systems. Overall, air brakes are a vital aspect of commercial vehicle operation in Manitoba, and they play a critical role in keeping the province’s roads safe and secure for everyone.

Drivingtest.ca has prepared this Air Brake practice test to assist drivers in understanding an air brake system’s essential operation and function. Requirements for Air Brake Endorsement are:

1) Must complete an Air Brake Written Test

2) Must complete an Air Brake Practical Test.

This endorsement permits the holder to drive vehicles equipped with air brakes in the vehicle class for which the driver is licensed.

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