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

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

The compressor is maintaining full reservoir air pressure

The push rod travel is within limitations on all chamber

The air leaks or minimal

The glad hands and the lines are secure

2 / 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

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

Verify the system is at full pressure

Secure the spring parking brake

3 / 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 stabilizes

None of these

Push rod force strengthens

4 / 30

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

Worn linings

Malfunctioning valves

Valves with normal release pressure

Overheated brakes

5 / 30

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

Release the spring parking brakes

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

6 / 30

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

Slippage and tension

Narrowness

Wear

Cracking

7 / 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

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

8 / 30

What will add to the overall push rod travel?

All of the above

The thickness of the push rod

The expansion of the brake drum because of heat

The overall age of the push rod

9 / 30

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

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

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

10 / 30

Brake failures are usually the result of...

Heavy loads

Brakes being out of adjustment

Catastrophic system failure

Poor connections

11 / 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

95 psi minimum and 100 psi maximum

75 psi minimum and 90 psi maximum

105 psi minimum and 135 psi maximum

12 / 30

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

30 minutes

20 minutes

10 minutes

40 minutes

13 / 30

How often should automatic slack adjusters be checked?

Daily

Weekly

Every 72 hours

Every 48 hours

14 / 30

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

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

Stop quickly to ensure everything works

15 / 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

Smelling any burning coming from the brakes

Watching the pressure gauges

Hearing the warning signals

16 / 30

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

Place your hand on the drum to test the temperature

None of these

Check each brake drum or rotor for temperature

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

17 / 30

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

Downwards

Upwards

Outwards

Inwards

18 / 30

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

1/4 to1/2 of a turn

3/4 to7/8 of a turn

1/8 to1/16 of a turn

5/8 to11/16 of a turn

19 / 30

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

35 psi or higher

25 psi or higher

45 psi or higher

55 psi or higher

20 / 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 of the heat generated by the drums

Because the shows become smaller with each application

21 / 30

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

The driver

Anyone

The carrier

A qualifies technician

22 / 30

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

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

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

None of these

23 / 30

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

A licensed technician

The carrier

Anyone on the team

The driver

24 / 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...

Another driver

Head of maintenance

The vehicle owner

The manufacturer

25 / 30

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

The prevent air loss

None of these

To prevent over filling

To prevent compounding the brake pressure

26 / 30

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

The thickness of the pads

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

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

27 / 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?

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

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

28 / 30

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

29 / 30

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

The system is at 50%

The system is fully empty

The system is at 25%

The system is at full pressure

30 / 30

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

Five

Four

Two

Three

Your score is

Air Brake Practice Test 08

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