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

How often should automatic slack adjusters be checked?

Every 48 hours

Every 72 hours

Daily

Weekly

2 / 30

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

40 minutes

30 minutes

10 minutes

20 minutes

3 / 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

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

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

4 / 30

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

5 / 30

Why do the shoes need to be adjusted?

All of the above

Because of the heat generated by the drums

Because the shows become smaller with each application

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

6 / 30

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

5/8 to11/16 of a turn

3/4 to7/8 of a turn

1/4 to1/2 of a turn

1/8 to1/16 of a turn

7 / 30

Brake failures are usually the result of...

Heavy loads

Catastrophic system failure

Brakes being out of adjustment

Poor connections

8 / 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

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

Ensure vehicle is secure and wheels blocked

Secure the spring parking brake

9 / 30

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

None of these

The prevent air loss

To prevent over filling

To prevent compounding the brake pressure

10 / 30

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

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

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

The thickness of the pads

11 / 30

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

Downwards

Outwards

Inwards

Upwards

12 / 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 stabilizes

Push rod force strengthens

Push rod force drops very quickly

None of these

13 / 30

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

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

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

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

14 / 30

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

Reapply the spring parking brake, remove wheel blocks

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

Turn off the engine and remove the key

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

15 / 30

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

The driver

Anyone

A qualifies technician

The carrier

16 / 30

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

The system is at 25%

The system is fully empty

The system is at full pressure

The system is at 50%

17 / 30

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

Stop quickly to ensure everything works

To physically check the brakes at each wheel

Listen to any unusual sounds from the brake chambers

Keep watch on the warning gauge on the dash

18 / 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 vehicle owner

Head of maintenance

The manufacturer

Another driver

19 / 30

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

Valves with normal release pressure

Overheated brakes

Malfunctioning valves

Worn linings

20 / 30

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

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

None of these

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 province

21 / 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

55 psi or higher

35 psi or higher

45 psi or higher

22 / 30

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

Place your hand on the drum to test the temperature

Check each brake drum or rotor for temperature

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

None of these

23 / 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...

Watching the pressure gauges

Feeling the braking response from the vehicle

Smelling any burning coming from the brakes

Hearing the warning signals

24 / 30

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

Narrowness

Wear

Slippage and tension

Cracking

25 / 30

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

65 psi minimum and 70 psi maximum

75 psi minimum and 90 psi maximum

105 psi minimum and 135 psi maximum

95 psi minimum and 100 psi maximum

26 / 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

27 / 30

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

The driver

The carrier

A licensed technician

Anyone on the team

28 / 30

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

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

Verify the system is at 50% pressure

Release the spring parking brakes

Ensure vehicle is secure and wheels are blocked

29 / 30

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

Four

Three

Five

Two

30 / 30

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

The glad hands and the lines are secure

The air leaks or minimal

The compressor is maintaining full reservoir air pressure

The push rod travel is within limitations on all chamber

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Air Brake Practice Test 08

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