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

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

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

Uses controlled braking to gain traction

2 / 30

Friction produces what?

Air pressure

Lubrication

Convection

Heat

3 / 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

4 / 30

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

Reducing the braking effort to the front wheels

Release the brakes quicker when a brake application is released.

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

Discharging the application air near the brake chambers

5 / 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

6 / 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

7 / 30

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

Applies

Decompresses

Cages

Coils

8 / 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

One, 100-120

Two, 80-100

Two to four, 80-100

9 / 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

Holds a supply of compressed air

Automatically exhausts moisture from the reservoir when required

10 / 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.

Eight

Four

Two

Ten

11 / 30

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

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

The brake drum to crack or warp.

Brake fade

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

12 / 30

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

Thickness, heat

Strength, force

Diameter, friction

Width, friction

13 / 30

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

A governor

A compressor

Spring parking brake chambers

A foot valve

14 / 30

Braking distance is defined as:

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

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

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,

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

Watching the gauges

All of these

Listening for warning signals

16 / 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 _________.

Service brakes, mounting bolts

Spring brakes, compressor

Clevis, pin

Spring brakes, service brakes

17 / 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

Release the spring parking brake

Disconnect supply (emergency) line glad hand

18 / 30

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

Driver's

Mechanic's

Owner's

Technician's

19 / 30

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

Cleaner, less

Colder, less

Warmer, less

More compressed, less

20 / 30

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

Wheel sensor

ABS valves

Tooth wheel

Electronic control unit

21 / 30

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

Engine power is reduced

Air from the trailer reservoir released to the brake chambers.

Brakes applied and released up to five times a second

Causes the limiting valve to operate

22 / 30

What does a kPa stand for?

Kilogram

Kilometre

Kilopascal

Pressure per square inch

23 / 30

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

Caged

Contained

Canned

Compressed

24 / 30

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

Push rod

Diaphragm

Slack adjuster

Mounting bolt

25 / 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

26 / 30

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

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

All of these

27 / 30

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

Gain a mechanical advantage

Increase stopping distance

Decrease the vehicle weight

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

28 / 30

What absorbs the heat produced by friction?

Diaphragm

Treadle

Brake lining

Metal brake drums

29 / 30

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

Motion, mechanical

Mechanical, heat

Friction, Heat

Heat, mechanical

30 / 30

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

Four

One

Three

Two

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.