Air Brake Practice Test 08

By practicing with this test, you’ll be able to walk into your official exam with flying colors, knowing that you’ve done everything possible to prepare yourself. Some key things to keep in mind as you study include understanding the different types of brakes, recognizing the various parts of an air brake system, and knowing how to conduct a proper pre-trip inspection. With hard work and focus, there’s no reason why you can’t ace your air brake test and achieve success in your driving career.

1 / 30

Which statement is false? The driver must be aware of the condition of the vehicle's braking system at all times. This can be done by...

Feeling the braking response from the vehicle

Hearing the warning signals

Watching the pressure gauges

Smelling any burning coming from the brakes

2 / 30

When checking the compressor and warning devices on the pre-trip inspection, the warning device(s) must operate to how many psi?

25 psi or higher

45 psi or higher

55 psi or higher

35 psi or higher

3 / 30

If the S-cam brake with automatic slack adjuster are badly out of adjustment, who should inspect them?

Anyone

The driver

The carrier

A qualifies technician

4 / 30

Which statement is false? When the brakes are out of adjustment, braking efficiency is reduced by the following factors...

Brake lag increases because additional air is required to fill and pressurize the increased chamber volume caused by the increased stroke of the push rod

The thickness of the pads

The angle between the slack adjuster arm and the push rod becomes more than 90°

The effectiveness of diaphragm brake chambers drops off significantly if the stroke exceeds 75% of its designed travel

5 / 30

When the brakes are adjusted by slack adjusters, the shoes are moved where?

Inwards

Upwards

Outwards

Downwards

6 / 30

How often should automatic slack adjusters be checked?

Weekly

Daily

Every 48 hours

Every 72 hours

7 / 30

Who must ensure that the vehicle has safe, properly adjusted brakes?

The carrier

Anyone on the team

The driver

A licensed technician

8 / 30

What will add to the overall push rod travel?

The expansion of the brake drum because of heat

The thickness of the push rod

All of the above

The overall age of the push rod

9 / 30

Which statement is false? The following are recommended adjustment steps for S-cam brakes with manual slack adjusters...

Verify the system is at full pressure

Ensure vehicle is secure and wheels blocked

Secure the spring parking brake

Use a wrench to disengage the external locking device (if so equipped) from the adjustment bolt of the slack adjuster

10 / 30

When checking the S-cam brake adjustment with manual slack adjuster, you should ensure...

The system is at 25%

The system is at 50%

The system is fully empty

The system is at full pressure

11 / 30

During a pre-trip inspection, you should ensure the reservoir air pressure builds from 50 to 90 psi within how many minutes?

Five

Two

Four

Three

12 / 30

At the first stop, what should be done after the brake adjustment?

Get up to highway speed and quickly apply the brakes to check if they are working

None of these

Check each brake drum or rotor for temperature

Place your hand on the drum to test the temperature

13 / 30

During an in-service check, which of the following is not checked?

The push rod travel is within limitations on all chamber

The glad hands and the lines are secure

The compressor is maintaining full reservoir air pressure

The air leaks or minimal

14 / 30

Since there are a number of makes and models of air disc brakes, each with a different adjustment procedure, it is recommended that you consult...

The manufacturer

Head of maintenance

Another driver

The vehicle owner

15 / 30

Why do the shoes need to be adjusted?

To minimize the amount of free travel when the brakes are applied

All of the above

Because the shows become smaller with each application

Because of the heat generated by the drums

16 / 30

Which of the following is not part of the brake test?

Turn off the engine and remove the key

Reapply the spring parking brake, remove wheel blocks

Gently tug against the spring parking brakes in low gear, it should hold the vehicle

Move vehicle ahead slowly and make a service brake application to check brake response

17 / 30

While performing a manual wedge brake adjustment, which of the following is not a required step?

On twin chamber units the adjusting slots are in the backing plate below the forward chamber and above the rear chamber

Remove dust cover from adjusting slots at two places on each brake

Leave wheels firmly on the ground

Turning the wheel by hand, use an adjusting spoon to turn the star wheel until the shoe develops a heavy drag on the drum

18 / 30

When checking for leakage, the pressure should not drop more than how many psi per minute?

19 / 30

Adjusting automatic slack adjusters by hand is not recommended unless...

You are thoroughly trained on the proper adjustment procedures as dictated by the province

You are thoroughly trained on the proper adjustment procedures as dictated by the vehicle owner

You are thoroughly trained on the proper adjustment procedures as dictated by the manufacturer

None of these

20 / 30

Which statement is false? Other factors that affect the braking ability of the vehicle, include...

Overheated brakes

Valves with normal release pressure

Worn linings

Malfunctioning valves

21 / 30

Which of the following is not a step used to determine if an S-cam brake with manual or automatic slack adjusters requires adjustment?

Make a chalk mark where each push rod enters the brake chamber

Ensure vehicle is secure and wheels are blocked

Reapply the spring parking brakes and measure the distance from the brake chamber to the chalk mark

Leave the engine running with the transmission in a low gear or park then release the spring parking brake

22 / 30

The only way to be sure your vehicle brakes are properly adjusted is...

Keep watch on the warning gauge on the dash

Stop quickly to ensure everything works

To physically check the brakes at each wheel

Listen to any unusual sounds from the brake chambers

23 / 30

During the pre-trip inspection, .check that the governor places the compressor in the unloading stage between how many psi?

105 psi minimum and 135 psi maximum

65 psi minimum and 70 psi maximum

75 psi minimum and 90 psi maximum

95 psi minimum and 100 psi maximum

24 / 30

Why should you release the spring parking brake at 90 psi or above?

To prevent compounding the brake pressure

None of these

To prevent over filling

The prevent air loss

25 / 30

The pre-trip air brake inspection should be completed within...

40 minutes

20 minutes

30 minutes

10 minutes

26 / 30

After adjusting the manual slack adjuster, backoff the adjustment bolt about how much of a turn?

1/8 to1/16 of a turn

1/4 to1/2 of a turn

3/4 to7/8 of a turn

5/8 to11/16 of a turn

27 / 30

The amount of force available at the push rod is consistent out to two inches of stroke. What happens after two inches?

Push rod force drops very quickly

None of these

Push rod force stabilizes

Push rod force strengthens

28 / 30

Which statement is false? The following are recommended steps to determine if an S-cam brake with manual slack adjusters requires adjustment...

Verify the system is at 50% pressure

Ensure vehicle is secure and wheels are blocked

Shut off the engine and leave the transmission in a low gear or park

Release the spring parking brakes

29 / 30

Brake failures are usually the result of...

Catastrophic system failure

Brakes being out of adjustment

Heavy loads

Poor connections

30 / 30

Which statement is false? During a pre-trip inspection, you should check the drive belt and pulleys for...

Slippage and tension

Narrowness

Cracking

Wear

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Air Brake Practice Test 08

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