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

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

Hydraulic brakes

Vacuum-assisted brakes

Nothing

A full air brake system

2 / 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 3/4° a turn

Normally 5/8° a turn

Normally 1/16° to 1/8° a turn

Normally 1/4° to 1/2° a turn

3 / 30

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

The secondary tank

The supply tank

The primary tank

The bottom of the foot valve

4 / 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

They were cheaper to maintain

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

5 / 30

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

Nothing

Light braking applications

A number of full brake applications

Cool air

6 / 30

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

Visual and audible

Vibration

Audible only

Just visual

7 / 30

Where is a relay valve installed?

Inside the rear wheel hubs

Under the foot valve

Near the rear brake chambers

Near the front brake chambers

8 / 30

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

Reset the system and take it to the shop for adjustments

Turn it off

Stop the vehicle and find the cause of the air loss

Add it to the pre-trip inspection

9 / 30

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

The carrier

The head of maintenance

The owner

The driver

10 / 30

Where is the one-way check valve installed?

Beside the compressor

Beside the governor

Between the reservoirs

Under the foot valve

11 / 30

When does fading or reduction in braking effort occur?

When parts of the brake pads break off

When the brakes rarely get used

When the heated drums expand away from the brake linings

When the driver fails to apply the brakes correctly

12 / 30

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

To prevent air from leaving the brake chambers

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

To prevent air from leaving the compressor

To prevent air from leaving the brake lines

13 / 30

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

A safety valve

A one-way valve

A quick release valve

A two-way valve

14 / 30

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

The age of the brakes

The thickness of the brake pads

The amount of times the brakes are applied

The thickness of the drums

15 / 30

Why are air-over hydraulic brake systems used?

They are easier to maintain

They are easier to install

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

They are smaller in size

16 / 30

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

None of these

Because of the size of the front brakes

Because of the manufacturer

Because of the steering action

17 / 30

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

Air actuated hydraulic brake system

They all need one

Air-over hydraulic brake system

Air-boost hydraulic brake system

18 / 30

Do automatic slack adjusters have to be checked?

Only if brake fade has happened

Only if inspected

Yes

19 / 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?

75 psi

65 psi

45 psi

55 psi

20 / 30

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

Improper installation

Inadequate maintenance

Deformed brackets

Straight push rods

21 / 30

What is the stop light switch?

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 controls the trailers

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

It controls the traffic lights for fire trucks

22 / 30

Manual adjustment of wedge brakes is usually done by whom?

The vehicle owner

The company owner

The driver

A qualified mechanic

23 / 30

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

Improper lining

Weak return springs

Distorted drums

Smooth brake lining

24 / 30

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

Wig mag

Zig zag

Wig wag

Mig mag

25 / 30

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

It can be installed on the trailers

Only for firetrucks

Yes

26 / 30

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

Anti-compound line

A supply line

A control line

Safety line

27 / 30

What is not one of the types of brake systems?

Hydraulic brakes

Cable brakes

Air-over hydraulic brakes

Wedge brakes

28 / 30

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

None of these

By testing the brakes periodically

By manually checking each tank

Through an air pressure gauge

29 / 30

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

They remove the brake shoes from against the drums

The s-cams can be removed

They force the brake shoes against the drums

None of these

30 / 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°

Your score is

Air Brake Practice Test 03

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