Air Brake Practice Test 03

Preparing for your Canadian air brake test can seem daunting, but taking the free Air Brake Practice Test can be an invaluable resource in helping you ace your official exam with flying colors. This practice test is designed to familiarize you with the official test format, giving you a better understanding of what to expect and helping to increase your confidence.

1 / 30

What happens when the slack adjusters rotate the S-cams?

The s-cams can be removed

They force the brake shoes against the drums

They remove the brake shoes from against the drums

None of these

2 / 30

Manual adjustment of wedge brakes is usually done by whom?

The company owner

The driver

A qualified mechanic

The vehicle owner

3 / 30

Due to over use or leaks, the low-pressure indicator switch will turn on a red warning light on the dash or cause a buzzer to sound at or before how much psi?

45 psi

55 psi

65 psi

75 psi

4 / 30

Whose responsibility is it to ensure that brakes are adjusted correctly?

The carrier

The driver

The head of maintenance

The owner

5 / 30

When the brakes are fully applied, the angle between the push rod and the arm of the slack adjuster should be no more than...

60°

90°

75°

80°

6 / 30

On manual slack adjusters, the adjusting worm bolt is turned until the brake linings touch the drums and then backed of how much?

Normally 5/8° a turn

Normally 1/4° to 1/2° a turn

Normally 1/16° to 1/8° a turn

Normally 3/4° a turn

7 / 30

The air line from the foot valve to the relay valve now becomes what?

Safety line

Anti-compound line

A supply line

A control line

8 / 30

What is the stop light switch?

It controls the trailers

It controls the traffic lights for fire trucks

It's an air-operated electric switch that turns on the brake lights at the rear of the vehicle when a brake application is being made

It's a switch that turns the brake lights off after application

9 / 30

What is the purpose of the one-way check valve?

To prevent air from leaving the compressor

To prevent air from leaving the brake lines

To prevent air from flowing backwards in the system toward the compressor

To prevent air from leaving the brake chambers

10 / 30

Do automatic slack adjusters have to be checked?

Yes

Only if brake fade has happened

Only if inspected

11 / 30

What is not one of the types of brake systems?

Air-over hydraulic brakes

Wedge brakes

Hydraulic brakes

Cable brakes

12 / 30

What may be required to keep the automatic brake adjusters in adjustment?

A number of full brake applications

Cool air

Nothing

Light braking applications

13 / 30

When does fading or reduction in braking effort occur?

When the brakes rarely get used

When the driver fails to apply the brakes correctly

When parts of the brake pads break off

When the heated drums expand away from the brake linings

14 / 30

Which air brake system does not require an air brake endorsement?

Air-over hydraulic brake system

Air-boost hydraulic brake system

Air actuated hydraulic brake system

They all need one

15 / 30

The low-pressure warning device must be comprised of which systems?

Just visual

Audible only

Vibration

Visual and audible

16 / 30

Why is a front axle assembly have the brake chamber and slack adjuster mounted on the backing-plate?

Because of the size of the front brakes

Because of the steering action

None of these

Because of the manufacturer

17 / 30

The governor controls the pressure in the reservoir to...

The bottom of the foot valve

The supply tank

The secondary tank

The primary tank

18 / 30

An air-boost hydraulic brake system is similar to what?

Hydraulic brakes

Vacuum-assisted brakes

Nothing

A full air brake system

19 / 30

Why are air-over hydraulic brake systems used?

They combine the best features of an air and hydraulic brake system

They are smaller in size

They are easier to install

They are easier to maintain

20 / 30

Can an additional gauge be installed on the dash to indicate the application air pressure when the brakes are applied?

Only for firetrucks

Yes

It can be installed on the trailers

21 / 30

Which statement is false? Dangerously undependable brake performance will result from what?

Improper lining

Smooth brake lining

Weak return springs

Distorted drums

22 / 30

What determines the amount of heat the brakes are able to absorb and dissipate into the atmosphere?

The age of the brakes

The amount of times the brakes are applied

The thickness of the brake pads

The thickness of the drums

23 / 30

Where is the one-way check valve installed?

Beside the compressor

Under the foot valve

Between the reservoirs

Beside the governor

24 / 30

What is another type of low-pressure warning device used on older vehicles?

Mig mag

Zig zag

Wig wag

Wig mag

25 / 30

What is required to allow the brakes to release quickly and fully by discharging the application air near the brake chambers?

A quick release valve

A safety valve

A two-way valve

A one-way valve

26 / 30

Which statement is false? A number of factors could result in the automatic slack adjuster not maintaining proper slack, including...

Improper installation

Deformed brackets

Inadequate maintenance

Straight push rods

27 / 30

How do drivers monitor the air pressure in each of the tanks?

Through an air pressure gauge

By manually checking each tank

By testing the brakes periodically

None of these

28 / 30

Whichever warning system is used, what must the driver do once it is activated?

Turn it off

Stop the vehicle and find the cause of the air loss

Add it to the pre-trip inspection

Reset the system and take it to the shop for adjustments

29 / 30

Where is a relay valve installed?

Near the rear brake chambers

Under the foot valve

Inside the rear wheel hubs

Near the front brake chambers

30 / 30

Which statement is false? Air over hydraulic brake systems were developed for medium weight vehicles because...

It gives the option of pulling an air brake equipped trailer

Medium weight vehicles do not require a full airbrake system

Diesel engines do not have a source for vacuum boosting unless they are equipped with a vacuum pump

They were cheaper to maintain

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Air Brake Practice Test 03

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