100+ Free Saskatchewan Air Brake Practice Questions

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2026 Statistics

Key Facts: Saskatchewan Air Brake Exam

80%

Passing Score

SGI

Exam Questions

SGI

$25 CAD

Exam Fee

SGI

45 min

Time Limit

SGI

60 psi

Low Air Warning Limit

SGI Manual

120-145 psi

Governor Cut-out Range

SGI Manual

The Saskatchewan Air Brake (Endorsement A) knowledge test is a 30-question multiple-choice exam administered by SGI. Candidates must score at least 80% (24 correct answers) to pass. The exam fee is $25 CAD. The test covers SGI air brake manual components like compressors, governors, reservoirs, safety valves, low-pressure warning devices, treadle valves, brake chambers, slack adjusters, emergency/parking systems, and pre-trip inspection procedures.

Sample Saskatchewan Air Brake Practice Questions

Try these sample questions to test your Saskatchewan Air Brake exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary purpose of the air compressor in an air brake system?

A.To cool the brake drums during heavy braking

B.To pump air into the reservoirs to build system pressure

C.To release the spring parking brakes directly

D.To control the amount of force applied to the brake pedal

Explanation: The air compressor is driven by the engine and is responsible for pumping atmospheric air into the reservoirs (air tanks). This builds up and maintains the air pressure required to operate the service, emergency, and parking brakes.

2According to the SGI Air Brake Manual, how far below the cut-out pressure does the governor normally let reservoir pressure fall before it cuts the compressor back in?

A.About 5 to 10 psi (34 to 69 kPa)

B.About 20 to 25 psi (138 to 172 kPa)

C.About 40 to 50 psi (276 to 345 kPa)

D.About 60 to 70 psi (414 to 483 kPa)

Explanation: The SGI Air Brake Manual states that the governor cut-in pressure is usually about 20 to 25 psi (138 to 172 kPa) below the cut-out pressure, but never less than 100 psi (690 kPa). This differential keeps the compressor cycling within the normal operating range instead of loading and unloading almost continuously.

3What is the purpose of the safety valve on the supply reservoir?

A.To release pressure if the governor fails and pressure exceeds 150 psi

B.To allow the driver to manually release the parking brakes

C.To prevent moisture from entering the service tanks

D.To warn the driver of low air pressure in the system

Explanation: The safety valve protects the system from over-pressurization. If the governor fails to cut out the compressor, the safety valve will open and vent air at approximately 150 psi (1,035 kPa) to prevent tank damage.

4What colour is the trailer supply line (emergency line) gladhand coupling?

A.Blue

B.Yellow

C.Red

D.Green

Explanation: In North America, including Saskatchewan, the trailer supply line (also known as the emergency line) and its gladhand coupling are color-coded red. This line carries high-pressure air to charge the trailer reservoirs and release the trailer parking brakes.

5What colour is the trailer service line gladhand coupling?

A.Red

B.Blue

C.Yellow

D.Black

Explanation: The trailer service line (which carries control pressure from the tractor's foot valve to apply the trailer's service brakes) is color-coded blue. This distinguishes it from the red supply line.

6What device alerts the driver if the system air pressure falls below 60 psi (414 kPa)?

A.A loud safety pop-off valve on the reservoir

B.A red trailer supply valve popping out from the dashboard

C.A low-pressure warning device (light and buzzer)

D.An engine automatic shutdown indicator

Explanation: Every vehicle equipped with air brakes must have a low-pressure warning device that activates when reservoir pressure drops below 60 psi (414 kPa). This typically consists of a bright red warning light and an audible buzzer.

7How should moisture and oil be removed from the air reservoirs?

A.By adding alcohol to the tanks daily

B.By running the engine at fast idle for 10 minutes

C.By opening the drain valves on all reservoirs daily

D.By replacing the compressor air filter weekly

Explanation: Moisture and oil condense inside the air reservoirs and must be drained daily by opening the drain valves on all tanks. Failure to drain reservoirs can cause water to freeze in winter, blocking air lines, or cause corrosion and valve failure.

8What does the yellow diamond-shaped knob on the dash control?

A.The tractor parking brakes

B.The trailer supply valve

C.The windshield wipers

D.The engine governor override

Explanation: The yellow diamond-shaped knob on the dashboard controls the tractor parking brakes. Pulling the knob out vents air from the spring chambers, allowing the heavy springs to mechanically apply the brakes.

9What does the red octagonal-shaped knob on the dash control?

A.The vehicle's hazard lights

B.The tractor's front axle brakes only

C.The trailer supply valve (charges the trailer lines)

D.The service brake application pressure

Explanation: The red octagonal-shaped knob on the dashboard controls the trailer supply valve. Pushing it in supplies air to the trailer supply line to charge the trailer reservoirs and release the trailer spring brakes.

10What is the purpose of gladhands in a tractor-trailer combination?

A.To secure the trailer cargo doors

B.To connect the electrical wiring between tractor and trailer

C.To connect the tractor and trailer air brake lines

D.To adjust the slack of the trailer brakes automatically

Explanation: Gladhands are coupling devices located at the rear of the cab and front of the trailer. They are used to connect the service (blue) and supply/emergency (red) air lines of the tractor to the trailer.

About the Saskatchewan Air Brake Exam

Practice question bank and preparation materials for the Saskatchewan Government Insurance (SGI) Air Brake endorsement knowledge exam.

Questions

30 scored questions

Time Limit

45 minutes

Passing Score

80%

Exam Fee

$25 CAD (Saskatchewan Government Insurance (SGI))

Saskatchewan Air Brake Exam Content Outline

20%

Compressor and Governor

Compressor cooling/lubrication, pumping cycles, and governor cut-in/cut-out pressures

25%

Reservoirs and Valves

Supply/service reservoirs, drains, check valves, safety valves, foot valves, and relay/quick-release valves

25%

Brake Chambers and Slack Adjusters

Service/spring chambers, manual/automatic slack adjusters, pushrod stroke limits, and adjustment methods

15%

Emergency and Parking Systems

Spring brakes, caging, parking brake dash control, tractor protection systems, and gladhands

15%

Pre-Trip Checks and Tests

In-cab and exterior pre-trip inspection steps, compressor build-up test, applied leak test, and warning devices

How to Pass the Saskatchewan Air Brake Exam

What You Need to Know

Passing score: 80%
Exam length: 30 questions
Time limit: 45 minutes
Exam fee: $25 CAD

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Saskatchewan Air Brake Study Tips from Top Performers

1Memorize the key pressures: cut-out (120-145 psi), cut-in (min 100 psi), low warning (min 60 psi), safety valve (150 psi).

2Be clear on slack adjuster stroke limits: Type 20 is 1 3/4", Type 24 is 1 3/4", Type 30 is 2", and long-stroke Type 30 is 2 1/2".

3Understand that you should NEVER manually adjust automatic slack adjusters to fix an out-of-adjustment condition, as this masks a mechanical failure.

4Practice the exact sequence of the in-cab pre-trip inspection, including the compressor build-up test (85 to 100 psi in under 2 minutes).

5Review the tractor protection system's components: trailer supply valve (red knob) and tractor protection valve.

Frequently Asked Questions

What is the passing score for the SGI air brake test?

You must score at least 80% (24 out of 30 questions correct) on the written computer-based knowledge test. Additionally, you must pass a practical demonstration exam (often called the 'practical test') where you show the examiner how to perform a pre-trip air brake inspection and adjust brakes.

How much does the Saskatchewan air brake exam cost?

The fee for the written air brake knowledge test is $25 CAD per attempt, payable to SGI. This $25 covers the knowledge test only; the separate practical demonstration test costs an additional $55, and validating the Endorsement A on your licence costs $15.

What are the key pressure limits in the SGI Air Brake manual?

Key pressure values include: governor cut-out pressure (120-145 psi), governor cut-in pressure (minimum 100 psi), low air warning device activation (minimum 60 psi), safety valve opening pressure (150 psi), and automatic spring brake application (20-45 psi).

What is the maximum pushrod stroke for standard Type 30 and Type 24 brake chambers?

For standard clamp-type chambers, the regulation pushrod stroke limit is 2 inches (51 mm) for a Type 30 chamber, and 1 3/4 inches (44 mm) for a Type 24 chamber. Any measurement at or above these limits is out of adjustment.

What are the maximum allowable air leakage rates in Saskatchewan?

With the engine off and brakes fully applied, the air leakage rate must not exceed 1 psi in one minute for a single vehicle (truck/bus), and must not exceed 4 psi in one minute for a combination vehicle (tractor-trailer).