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

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

55 psi or higher

35 psi or higher

45 psi or higher

25 psi or higher

2 / 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

95 psi minimum and 100 psi maximum

105 psi minimum and 135 psi maximum

3 / 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

4 / 30

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

The system is fully empty

The system is at full pressure

The system is at 25%

The system is at 50%

5 / 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

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 manufacturer

6 / 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

Push rod force strengthens

None of these

Push rod force stabilizes

7 / 30

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

The carrier

The driver

A licensed technician

Anyone on the team

8 / 30

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

Anyone

The carrier

The driver

A qualifies technician

9 / 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

10 / 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...

Hearing the warning signals

Smelling any burning coming from the brakes

Watching the pressure gauges

Feeling the braking response from the vehicle

11 / 30

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

None of these

To prevent over filling

To prevent compounding the brake pressure

The prevent air loss

12 / 30

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

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

Leave wheels firmly on the ground

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

13 / 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?

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

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

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

14 / 30

How often should automatic slack adjusters be checked?

Every 48 hours

Weekly

Every 72 hours

Daily

15 / 30

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

Upwards

Downwards

Outwards

Inwards

16 / 30

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

10 minutes

40 minutes

20 minutes

30 minutes

17 / 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...

Head of maintenance

Another driver

The vehicle owner

The manufacturer

18 / 30

What will add to the overall push rod travel?

The overall age of the push rod

The thickness of the push rod

All of the above

The expansion of the brake drum because of heat

19 / 30

Why do the shoes need to be adjusted?

All of the above

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

Because the shows become smaller with each application

Because of the heat generated by the drums

20 / 30

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

Ensure vehicle is secure and wheels blocked

Secure the spring parking brake

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

21 / 30

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

Overheated brakes

Malfunctioning valves

Worn linings

Valves with normal release pressure

22 / 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 air leaks or minimal

The compressor is maintaining full reservoir air pressure

23 / 30

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

24 / 30

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

Reapply the spring parking brake, remove wheel blocks

Turn off the engine and remove the key

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

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

25 / 30

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

Ensure vehicle is secure and wheels are blocked

Verify the system is at 50% pressure

Release the spring parking brakes

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

26 / 30

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

Slippage and tension

Wear

Narrowness

Cracking

27 / 30

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

1/8 to1/16 of a turn

3/4 to7/8 of a turn

5/8 to11/16 of a turn

1/4 to1/2 of a turn

28 / 30

Brake failures are usually the result of...

Poor connections

Heavy loads

Brakes being out of adjustment

Catastrophic system failure

29 / 30

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

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

The thickness of the pads

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

30 / 30

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

Stop quickly to ensure everything works

Listen to any unusual sounds from the brake chambers

Keep watch on the warning gauge on the dash

To physically check the brakes at each wheel

Your score is

Air Brake Practice Test 08

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