BC Air Brake Practice Test 07

Taking the BC air brake practice test is a crucial step towards obtaining your commercial driver’s license. It provides an opportunity to familiarize yourself with the format and content of the official exam. By taking the practice test multiple times, you can assess your strengths and weaknesses and focus your studying accordingly. When the time comes to take the official exam, it is essential to remain calm and confident.

BC Air Brake Test 07

1 / 30

Do cast iron brake drums expand when heated?

Yes

Not in cool weather

After roughly 50 applications

2 / 30

Should each brake on an axle be adjusted to have a similar amount of pushrod travel?

Yes

They are all separate

They can be quite off, but as long as they work

3 / 30

Once you know the proper direction, why do you continue turning until solid resistance is met?

To know you're done

It indicates that the brake linings have contacted the brake drum

It indicates that the pushrod is at the maximum depth

To know you're half way through the adjustment

4 / 30

Do air-brake-equipped vehicles lose their brakes?

Once every 1500 km traveled

Once every 500 km traveled

Once a month

Rarely

5 / 30

When correctly adjusted, what is the running clearance between the brake lining and drum?

1/64 of an inch

A few thousandths of an inch

1/32 of an inch

1/16 on an inch

6 / 30

When using the pry method of free stroke measurement, what psi should the air system be?

Less than 100 psi

Over 100 psi

Less than 60 psi

Between 60 and 90 psi

7 / 30

How can you visually verify that the linings have contacted the drum?

You can't

If the brake has no dust shields, or if you can see the brake shoes and linings through an inspection slot

Crawl underneath the vehicle

Use a magnifying glass

8 / 30

How much should you back off the adjusting bolt to establish correct running clearance between the lining and drum?

about 1/3 of a turn

about 1/4 of a turn

about 1/2 of a turn

about 2/3 of a turn

9 / 30

How would you know if the adjusting bolt is being turned in the wrong direction?

The adjusting bolt is too loose to move

None of the above

The adjusting bolt is too tough to move

If the slack adjuster is pulling the pushrod out of the chamber when you turn the adjusting bolt

10 / 30

What happens if the brakes on one or the other axle have been mistakenly backed off?

A warning light shows on the dash

Nothing serious happens

It creates a serious safety hazard

It's tough to remove the wrench

11 / 30

Would the s-cam brakes seem to be effective when the brake drum is cool and with normal brake application pressure?

Yes

In wet weather

Only at slow speeds

12 / 30

With the applied stroke method of servicing s-cam brakes, what is the minimum reservoir pressure required?

80 psi

100 psi

65 psi

70 psi

13 / 30

Which statement is false? Make sure you have the proper equipment to check the brakes, including...

Chalk or other marker, and a ruler or other marking device, to check pushrod free stroke

Lubricant

A tool to pry on the air brake chamber pushrod to check for free stroke

A flashlight to inspect components

14 / 30

New air brake chamber pushrods have a marking. What does it indicate?

None of the above

To indicate when brake adjustment must be done immediately

When the pushrod needs to be replaced

That braking pressure is too severe

15 / 30

Why should you turn off the engine while doing brake adjustments?

To relax the lines

To listen for leaks

None of the above

To cool the brakes

16 / 30

What is done with a spring-loaded locking sleeve on most manual slack adjusters?

Pull it out and turn it counter clockwise

Pull it out so the adjusting bolt can be turned

Press it in and hold it so the adjusting bolt can be turned

Pull it out and turn it clockwise

17 / 30

On long downgrades, what can the expansion of hot brake drums can cause?

Nothing

A longer but controlled stop

A total loss of braking and result in a runaway

Shorter stopping distance because of the friction

18 / 30

When you turn the adjusting bolt, why are you watching the end of the camshaft?

It should become loose

It should remain tight as the bolt is being turned

None of the above

It should rotate slightly as the bolt is being turned

19 / 30

What size wrench is typically used to turn the adjusting bolt?

3/8 inch

9/16 inch

1/2 inch

3/4 inch

20 / 30

What is meant by pushrod travel?

The distance the pushrod extends from the air brake chamber when the brakes are released

The measurement from one end of the pushrod to the other

The diameter of the pushrod

The distance the pushrod extends from the air brake chamber when the brakes are applied

21 / 30

Which statement is false? While checking air brakes look for other brake component wear and excessive play including...

Clevis pin wear

S-cam spline wear

Thread wear

S-cam bushing wear

22 / 30

When using the pry method of free stroke measurement, when would the brakes need adjustment?

If the distance is more than 1 1/4 of an inch

If the distance is more than 3/4 of an inch

If the distance is more than 1 1/2 of an inch

If the distance is more than 1/4 of an inch

23 / 30

Is it common, especially on tandem axle units, for the adjusting bolts on one axle to adjust in one direction, while the other axle requires an opposite turn?

On new vehicles only

Yes

On older vehicles only

24 / 30

Can s-cam brakes be adjusted very accurately with the wheels on the ground?

Just the tractor brakes can

Just the trailer brakes can

Yes

25 / 30

How would you know if the previous slack adjustment was done incorrectly?

If the pushrod was tight

If the pushrod goes into the chamber

If there is wear markings

If the pushrod was loose

26 / 30

To perform a leak test, hold a firm brake application for 1 minute, you cannot lose any more then how many psi?

7 psi

5 psi

9 psi

3 psi

27 / 30

When adjusting the brakes, what should the air system be?

80% pressure

50% pressure

75% pressure

Full pressure

28 / 30

When using the applied stroke method of checking the s-cam brakes, at what distance should the brakes require adjustment?

More than 1 1/8 inch

More than 1 1/4 inch

More than 1 1/2 inch

More than 1 3/4 inch

29 / 30

Once the leak test is completed, how much air pressure as a minimum should you confirm there is in the reservoirs?

80 psi

90 psi

70 psi

100 psi

30 / 30

Who uses the applied stroke method for checked adjusting s-cam brakes?

Carriers

Roadside inspectors

Drivers

Peace officers

Your score is

BC Air Brake Practice Test 07

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