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

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

A full turn

1/2 a turn

1/4 turn

3/4 turn

2 / 30

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

Plus or minus 3 degrees

Plus or minus 10 degrees

Plus or minus 20 degrees

Plus or minus 7 degrees

3 / 30

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

The automatic slack adjuster needs a manual adjustment

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

None of the above

There is a leak within the air lines

4 / 30

What is a reliable substitute for physically checking brake adjustment?

A flashing light mounted on the dash

There isn't one

Using proper automatic slack adjusters

A gauge mounted on the dash

5 / 30

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

It usually means a manual adjustment is needed

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

None of the above

It would mean a secondary adjustment is required

6 / 30

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

A 1/4 inch

A 3/4 inch

A 3/8 inch

A 1/2 inch

7 / 30

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

The adjusting bolt

The hex cap

The prawl

The spring

8 / 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?

Yes

Just buses

Only on modern vehicles

9 / 30

Where is the parking brake control valve located?

Between the seats

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

At the rear of the trailer

It's mounted on the dashboard

10 / 30

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

You will need this information for the pre-trip inspection

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

It's part of the warranty

None of the above

11 / 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 8 to 12 psi range

The 15 to 18 psi range

The 3 to 5 psi range

The 5 to 7 psi range

12 / 30

Why are manual adjustment of automatic slack adjusters dangerous?

They aren't dangerous if done correctly

It could break them

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

You could over-adjust them

13 / 30

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

They are usually slightly shorter

There is no difference

They are thicker in diameter

They are usually slightly longer

14 / 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?

Yes it is

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

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

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

15 / 30

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

None of the above

When the pressure is at 90 to 100 psi

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

When you hear a clicking sound

16 / 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?

Nothing, it's normal

You are using the wrong wrench

You have stripped the gears

You are backing off too much

17 / 30

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

A 70 to 85 psi application

A 90 to 100 psi application

A 70 to 80 psi application

A 60 to 70 psi application

18 / 30

Do automatic slack adjusters still need to be regularly checked?

Yes

Only on new vehicles

Only if towing trailers

19 / 30

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

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

Every 50,000 km

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

Every 25,000 km

20 / 30

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

It is permissible when vehicles reach a certain age

Yes

It's permissible when done correctly

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

A counter clockwise direction until the lining contacts 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 two inches using the brake application — applied stroke method

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

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

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

23 / 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

24 / 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?

1/8 of an inch

1/4 of an inch

1/16 of an inch

1/32 of an inch

25 / 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

15 psi

5 psi

17 psi

26 / 30

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

A peace officer will ask you to check

To ensure that correct adjustment is being maintained

To ensure any part of the brakes have not broken off

It helps fill the time

27 / 30

What is the advantage of automatic slack adjusters?

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

None of the above

28 / 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 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

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

29 / 30

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

Certain gauges can

Yes

Most gauges can

30 / 30

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

One

Three

Two

Four

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BC Air Brake Practice Test 08

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