Saskatchewan Commercial Drivers License Air Brakes Practice Test 3

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Saskatchewan Air Brakes Practice Test 3

A 20 question practice test to help prepare you for your air brakes knowledge test in Saskatchewan

1 / 20

How much air loss is allowed for a tractor and a trailer when the brakes are engaged?

32 kPa/minute

28 kPa/minute

34 kPa/minute

26 kPa/minute

2 / 20

If brake chambers on opposite side of an axle are different sizes, this may cause?

Unbalanced braking

Efficient stopping

More power than necessary

Unbalanced weight

3 / 20

Where is the brake lining fastened?

The brake shoe

The rim of the tire

The struts

The wheel well

4 / 20

Cut in pressure level must never fall below __________.

413 kPa (60 psi)

690 kPa (100 psi)

345 kPa (50 psi)

551 kPa (80 psi)

5 / 20

What is the best way to inspect an air compressor?

With the engine on in first gear

With the engine on in neutral

With the engine on and in high gear

With the engine off

6 / 20

To measure the time it takes to build up pressure in the air system, the engine should be idling between _______________.

1000 to 2000 RPM

800 to 1000 RPM

600 to 900 RPM

200 to 500 RPM

7 / 20

You test a tractor protection valve by removing the service line and?

Starting the truck

Driving 150 metres

Switching the gears

Engaging the brake pedal

8 / 20

Trailer air brake systems must apply a spring brake when the pressure drops below?

414 kPa (60 psi)

690 kPa (100 psi)

514 kPa (74 psi)

242 kPa (35 psi)

9 / 20

A vehicle should have wheel chocks or blocks securing it in place during inspection if...?

The driver leaves the cab under any circumstances

Any of these apply

The driver leaves the cab without applying the parking brake

The driver is not within 50 m of the vehicle

10 / 20

The pushrod stroke occurs when compressed air enters the?

Air compressor

Supply tank

Brake chamber

Engine block

11 / 20

The low air pressure warning device needs to be replaced or adjusted if it does not trigger at a minimum level of?

551 kPa (80 psi)

242 kPs (35 psi)

380 kPa (55 psi)

413 kPa (60 psi)

12 / 20

You should be looking for this when checking your brake chambers?

Cracks or other damage

Mismatched slack adjuster lengths

New holes from wear and tear

All of the below

13 / 20

A commercial vehicle with air brakes engaged must not lose air pressure faster than?

38 kPa/minute

26 kPa/minute

21 kPa/minute

32 kPa/minute

14 / 20

Before inspecting for air brake chamber leaks, you must __________.

Start the engine

Cover the chamber in soapy water

Release the spring brakes and apply the service brake

Fill the compressor

15 / 20

Which tank should be drained first when draining the air tanks on an air brake system?

The first air tank

The last air tank

The supply tank

The second air tank

16 / 20

The spring brake is designed for which situation?

Loading skids into the trailer

Parking and emergencies

Skids and parking

Skids and emergencies

17 / 20

When brakes become overheated they also become?

Very hot

Extra efficient

Dangerously inefficient

None of the above

18 / 20

Cut out pressure level must never exceed __________.

690 kPa (100 psi)

1138 kPa (165 psi)

862 kPa (125 psi)

1000 kPa (145 psi)

19 / 20

What does a governor do in an air brake system?

Regulates the air pressure

Tells the other brakes what do to

Limits the speed by using automatic braking

Regulates the tire pressure

20 / 20

How long should it take for the air pressure to rise from 587kPa to 690 kPa after the pressure had fallen below 552 kPa?

1 min

5 mins

4 mins

2 mins

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More Saskatchewan Commercial Driving Practice Tests

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Saskatchewan Class 3 Practice Tests

Air Brakes Practice Tests

Saskatchewan Class 4 Practice Tests

Saskatchewan Road Signs Test

We do our best to keep the questions current and accurate. The testing centres may change the questions on the knowledge tests at any time. Always be prepared for surprises.

Many of the answers to the questions can be found in the driver hand books or learning materials your province provides.

DISCLAIMER:CDHQ is not affiliated with the provinces or any test centres. These practice tests should not be considered official tests and you are not granted a license for completing them. Our tests are simply a practice tool to help prepare yourself for the real test.