MANITOBA AIR BRAKE PRACTICE TEST 03

Air brakes are a critical component in the safe operation of commercial vehicles in Manitoba, Canada.

Air Brake Test 03

1 / 30

What does the acronym psi stand for?

Pressure per square inch

Pounds per square inch

Pounds per stopping inch

Pressure per stopping inch

2 / 30

Can the trailer brake hand valve be used for parking?

Always

None of the above

Never

Only to hold a parked vehicle

3 / 30

When checking for reservoir air leakage for a single unit, after making a full brake application with the foot valve and holding it the air pressure gauge reading should not drop more than __ psi per minute.

4 / 30

What should be done to parked trailers without spring parking brakes to prevent a possible runaway?

Park on a decline

Block wheels

Exhaust the supply line

Apply emergency break

5 / 30

What is used to mark where the push rod enters the brake chamber when determining whether an S-cam brake with manual slack adjusters requires adjustment?

Grease

Crayon

Marker

Chalk

6 / 30

Choose the correct order of steps for the compressor and warning devices check as part of a single unit pre-trip air brake inspection.

Ensure reservoir air pressure builds from 50 to 90 psi within three minutes; release the spring parking brake at 90 psi or above to prevent compounding the brake pressure; start the engine and run at fast idle to build air pressure; check that warning device(s) must operate to 55 psi or higher

Start the engine and run at fast idle to build air pressure; check that warning device(s) must operate to 55 psi or higher; ensure reservoir air pressure builds from 50 to 90 psi within three minutes; release the spring parking brake at 90 psi or above to prevent compounding the brake pressure

Release the spring parking brake at 90 psi or above to prevent compounding the brake pressure; start the engine and run at fast idle to build air pressure; check that warning device(s) must operate to 55 psi or higher; ensure reservoir air pressure builds from 50 to 90 psi within three minutes

Check that warning device(s) must operate to 55 psi or higher; ensure reservoir air pressure builds from 50 to 90 psi within three minutes; release the spring parking brake at 90 psi or above to prevent compounding the brake pressure; start the engine and run at fast idle to build air pressure

7 / 30

What would be the psi if 50 pounds were being forced onto 2 square inches?

100

8 / 30

One kilogram is equal to how many pounds?

1.5

2.2

9 / 30

Which of the following vehicles would require checking the hydraulic fluid level in the reservoir as part of the pre-trip check?

Combination with air actuated brake system

Combination with a dual brake system

Single with dual brake system

Single with a basic air brake system

10 / 30

If an air-actuated hydraulic brake system was to lose its air supply, the vehicle would have no service brakes. Only the __________ would be operating.

Air lines

Reservoir

Parking brake

Compressor

11 / 30

Discounting self-lubricated compressors, how are compressors usually lubricated?

From the engine lubrication system

Does not need lubrication

From grease application

From the brake fluid

12 / 30

One gram is equal to how many ounces?

2.2

0.5

0.035

13 / 30

One metre is equal to how many yards?

2.09

5.5

0.5

1.09

14 / 30

For a combination unit, during what part of the pre-trip check do you ensure that the reservoir air pressure builds from 50 to 90 psi within three minutes?

Tractor and trailer emergency system check

Brake adjustment

Compressor and warning devices check

Vehicle securement

15 / 30

At the first stop after adjusting the wedge type brakes, check each brake drum or rotor for temperature. An extra _______ brake drum indicates that you have _____ adjusted it.

Hot, under

Cold, under

Cold over

Hot, over

16 / 30

In an air-boost hydraulic brake system what is used to intensify the hydraulic pressure generated by the master cylinder?

Air pressure

Wedge

Vacuum

Power screw

17 / 30

When inspecting brake adjustment on a single unit, the slack (push rod travel) should be within how many inches within manufacturer's specifications?

1 - 2½

½ - 1¾

¾ - 1½

1½ - 2

18 / 30

What is the upward motion of the piston that compresses the air in the cylinder known as?

Cylinder stoke

Intake stoke

Loading stoke

Compression stoke

19 / 30

For a combination unit, during what part of the pre-trip check do you ensure that the air brake glad hands and trailer electrical cord is connected properly?

Brake test

Tractor and trailer emergency system check

Vehicle securement

Compressor and warning devices check

20 / 30

If a brake is out of adjustment and there is not enough reserve stroke of the push rod travel to compensate for drum expansion, this will cause ________.

Excessive moisture in reservoirs

Brake fade

Complete brake loss

Seized brake camshafts

21 / 30

Choose the correct order of steps to secure a vehicle as part of a single unit pre-trip air brake inspection.

Block the wheels; check that the compressor is secure; check the drive belt and pulleys for wear, cracking, slippage and tension; set the spring parking brake on the vehicle

Check the drive belt and pulleys for wear, cracking, slippage and tension; set the spring parking brake on the vehicle; block the wheels; check that the compressor is secure

Check that the compressor is secure; check the drive belt and pulleys for wear, cracking, slippage and tension; set the spring parking brake on the vehicle; block the wheels

Set the spring parking brake on the vehicle; block the wheels; check that the compressor is secure; check the drive belt and pulleys for wear, cracking, slippage and tension

22 / 30

An air dryer may be installed between the ________ and the ________ to help remove moisture from the compressed air.

Governor, compressor

Wet reservoir, governor

Compressor, wet reservoir

Control port, wet reservoir

23 / 30

On a combination unit, the governor should place the compressor in the unloading stage between ___ psi minimum and ___ psi maximum.

115, 135

100, 115

150, 175

125, 145

24 / 30

What protects the wet reservoir from becoming over pressurized?

Foot valve

Governor

Safety valve

Treadle

25 / 30

During the '_______' stage, the compressor is able to cool.

Intake stoke

Compression stoke

Unloading

26 / 30

When conducting a compressor and warning device check for a single unit, warning device(s) must operate to __ psi or higher.

100

27 / 30

How often do automatic slack adjusters need to?

Monthly

Daily

Weekly

Every other day

28 / 30

After a long mountain drive, what is the best way to park if your vehicle has spring parking brakes?

Make sure wheels are turned toward the curb

Make a service brake application

Apply spring breaks like usual

Leave the transmission in the lowest gear and block the wheels

29 / 30

In a dual air brake system, if one circuit develops a leak, the other circuit would be protected from air pressure loss by the __________________.

Primary reservoir

Front brake chamber

Foot valve

Two-way check valve

30 / 30

Which of the following does not usually have a pressure gauge?

Secondary reservoir

Primary reservoir

Wet reservoir

Dry reservoir

Your score is

Since the introduction of the mandatory air brake endorsement in 1996, all drivers of commercial vehicles with air brakes must pass a practical and written test to receive this endorsement. The practical test evaluates the driver’s ability to conduct a pre-trip inspection of the air brake system, perform a brake check, and complete a controlled stop. The written test covers the theory and operation of air brakes, including the various components involved in the system and how they work together to slow and stop a vehicle safely. Furthermore, Manitoba government officials recognize the importance of keeping air brake training and endorsement requirements up to date with current industry standards. As such, Manitoba is one of the few jurisdictions in North America that has implemented mandatory air brake endorsement renewals for commercial drivers. By ensuring that drivers are knowledgeable and trained on air brake systems, Manitoba is proactively promoting road safety for all Manitobans.

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.