BC Air Brake Practice Test 08

Remember to apply the skills and knowledge you have acquired through preparation, and use your critical thinking skills to interpret questions and answers accurately. With dedication, diligence, and a bit of luck, you can pass your official BC air brake exam with flying colors and begin your career as a professional commercial driver.

BC Air Brake Test 08

1 / 30

Most manufacturers of automatic slack adjusters specify that pushrod stroke be checked by making how much of an application?

A 70 to 80 psi application

A 60 to 70 psi application

A 90 to 100 psi application

A 70 to 85 psi application

2 / 30

Which statement is false? All trucks use piston-type air compressors. Depending on their demands, how many cylinders would they have?

Two

One

Four

Three

3 / 30

Why should automatic slack adjusters still need to be regularly checked?

To ensure any part of the brakes have not broken off

It helps fill the time

To ensure that correct adjustment is being maintained

A peace officer will ask you to check

4 / 30

If the slack adjuster has a square adjusting bolt located at the bottom end of the body, when should you adjust it?

When you hear a clicking sound

None of the above

When a spring-loaded pawl that meshes with internal teeth is disengaged

When the pressure is at 90 to 100 psi

5 / 30

Do you need to record on your daily post-trip inspection if you make an emergency adjustment of an automatic slack adjuster?

Only if it's company policy

Only if you are leaving the province

Yes

6 / 30

How often should automatic slack adjusters be checked by a mechanic at every chassis lubrication interval?

Every 50,000 km

Every 40,000 km, or every three months, whichever comes first

Every 25,000 km

Every 30,000 km, or every 6 months, whichever comes first

7 / 30

Is it illegal to retrofit manual slack adjusters on a vehicle manufactured with automatic slack adjusters?

Yes

It's permissible when done correctly

It is permissible when vehicles reach a certain age

8 / 30

While backing off while checking and adjusting automatic slack adjusters, it may take considerable force and you may hear or feel ratcheting. What does this mean?

You are using the wrong wrench

Nothing, it's normal

You have stripped the gears

You are backing off too much

9 / 30

How much should you back off the adjusting bolt by to restore running clearance?

1/2 a turn

3/4 turn

1/4 turn

A full turn

10 / 30

If you have no application pressure gauge and are checking and adjusting automatic slack adjusters, what should you do?

Turn the engine off and pump the reservoir pressure down to between 90 and 100 psi, then make a full application

Turn the engine off and pump the reservoir pressure down to between 70 and 80 psi, then make a full application

Turn the engine off and pump the reservoir pressure down to between 60 and 70 psi, then make a full application

Turn the engine off and pump the reservoir pressure down to between 70 and 85 psi, then make a full application

11 / 30

Some parking brake control valves and trailer supply valves will remain in the open position with as little as how much psi?

20 psi

5 psi

15 psi

17 psi

12 / 30

Does a 90-degree angle between the centre of the slack adjuster arm and the chamber pushrod with the brakes applied a good indication that the brake is adjusted correctly?

It is more dependent on the brake adjustment than the length of the chamber pushrod

It's better it the angle is at a 45-degree angle

It is more dependent on the length of the chamber pushrod than on brake adjustment

Yes it is

13 / 30

Slack adjusters with square adjusting bolts have what size hexagonal (hex) cap located on the slack adjuster body?

A 1/2 inch

A 1/4 inch

A 3/8 inch

A 3/4 inch

14 / 30

Where is the parking brake control valve located?

At the rear of the trailer

It's a pedal to the left of the foot valve

It's mounted on the dashboard

Between the seats

15 / 30

Why is it recommended that you get the service data books for the make of automatic slack adjusters that you are using?

It's part of the warranty

They contain all the information needed to keep them operating properly, including lubrication requirements, initial setup, inspection and testing

None of the above

You will need this information for the pre-trip inspection

16 / 30

Which statement is false? On units that don't have the button, what must be removed?

The spring

The prawl

The adjusting bolt

The hex cap

17 / 30

Why are manual adjustment of automatic slack adjusters dangerous?

It gives a false sense of security about the effectiveness of the braking system

They aren't dangerous if done correctly

You could over-adjust them

It could break them

18 / 30

What's the difference between pushrod strokes with automatic slack adjusters and well-adjusted manual slack adjusters?

They are usually slightly longer

They are thicker in diameter

There is no difference

They are usually slightly shorter

19 / 30

Is it true that most truck reservoir gauges don't have fine enough markings to accurately estimate such pressure change?

Certain gauges can

Most gauges can

Yes

20 / 30

To prevent interference between the slack adjuster and suspension parts, some manufacturers will vary the angle up to how much?

Plus or minus 20 degrees

Plus or minus 10 degrees

Plus or minus 7 degrees

Plus or minus 3 degrees

21 / 30

If the slack adjuster has a hexagonal (six-sided) adjusting bolt, the brakes may be set up by turning the adjusting bolt in which direction?

A counter clockwise direction until the lining contacts the drum

A clockwise direction until the lining is 1/2 inch from contacting the drum

A clockwise direction until the lining contacts the drum

A counter clockwise direction until the lining is 1/2 inch from contacting the drum

22 / 30

With a typical Type 30 clamp type air chamber and an automatic slack adjuster, the brakes need repair if pushrod measurements are how long?

More than three inches using the brake application — applied stroke method

More than one inch using the brake application — applied stroke method

More than two inches using the brake application — applied stroke method

More than a half inch using the brake application — applied stroke method

23 / 30

Do automatic slack adjusters still need to be regularly checked?

Only on new vehicles

Only if towing trailers

Yes

24 / 30

If an automatic slack adjuster strokes beyond the maximum allowed, what does it mean?

It usually indicates that there are other brake problems that need to be repaired by a qualified brake service mechanic

It would mean a secondary adjustment is required

It usually means a manual adjustment is needed

None of the above

25 / 30

What is a reliable substitute for physically checking brake adjustment?

A gauge mounted on the dash

Using proper automatic slack adjusters

There isn't one

A flashing light mounted on the dash

26 / 30

If a pushrod stroke is excessive during one of these mandatory checks, what is the problem?

None of the above

The automatic slack adjuster needs a manual adjustment

There is a leak within the air lines

The automatic slack adjuster has either failed, been incorrectly installed, or there is a problem within the foundation brake

27 / 30

What is the advantage of automatic slack adjusters?

None of the above

They adjust themselves during normal brake applications made in day-to-day driving

They reduce the amount of manual adjustments that need to be made

It saves the driver time as they don't need to be checked during pre-trip inspections

28 / 30

Some of these hex caps are equipped with a round 'button' that can be pried up approximately how far and held, using a screwdriver?

1/16 of an inch

1/32 of an inch

1/8 of an inch

1/4 of an inch

29 / 30

Is it true that on vehicles with tandem axles, it's common to find that one axle sets up with a clockwise turn, while the other requires a reverse direction?

Just buses

Only on modern vehicles

Yes

30 / 30

Modern trucks have very large air reservoirs, and even if all the brakes had excess pushrod travel, the pressure drop would not reach how much?

The 15 to 18 psi range

The 3 to 5 psi range

The 5 to 7 psi range

The 8 to 12 psi range

Your score is

BC Air Brake Practice Test 08

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