Air Brake Exam - The Drive Test

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3 - Air Brake Test

Practice Test - 3

30 Questions

Passing Marks - 80%

1 / 30

What component helps control brake shoe movement in drum brakes?

Cam roller

Return spring

Anchor pin

Pushrod

2 / 30

When brake chamber pushrod stroke exceeds the adjustment limit:

Vehicle stopping distance become chart

Vehicle braking capacity will increase

The spring brakes will still work normally

Breaking ability is reduced

3 / 30

Why do vehicle service brakes failed to apply, emergency brakes can be applied by using the:

Spring brake control valve

Tractor protection valve

Trailer hand valve

Brake pedal

4 / 30

How should drivers test the low-pressure warning system?

Reduce air pressure by pumping the brakes

Drain the air tanks completely

Increase engine RPMs

Turn off the engine and observe warning lights

5 / 30

How can drivers check for proper brake adjustment during a pre-trip inspection?

Measure pushrod stroke during brake application

Check governor cut-in pressure

Inspect air tank pressure gauges

Observe air compressor operation

6 / 30

Spring brake chambers:

Are smaller than service brake chamber

Are larger than service brake chamber

Are less likely to be out of adjustment than service brake chambers

Always have square ports

7 / 30

What happens if the air pressure in the primary circuit drops below safe levels?

The parking brakes automatically engage

The air compressor shuts off

The relay valve stops working

The secondary circuit provides backup braking

8 / 30

Disk brake components includes:

Rotors and brake drums

Camshafts and brake shoes

Camshafts and brake callipers

Callipers and rotors

9 / 30

Alcohol evaporates may be used to:

Remove water vapour from the air brake system

Heat the air brake system to help prevent freezing

Add water to the air brake system to prevent freezing

Help prevent moisture in the air brake system from freezing

10 / 30

How often should spring brakes be checked for proper operation?

Weekly

Monthly

Only when issues arise

During every pre-trip inspection

11 / 30

A vehicles brakes must do more wok when:

None of the above

The vehicle goes slower

The vehicle carries less weight

The vehicle goes faster

12 / 30

What is the role of a relay valve in an air brake system?

To reduce braking response time

To adjust governor settings

To maintain parking brake pressure

To increase air tank capacity

13 / 30

The trailer hand valve is used to:

Release the towing vehicle spring brakes

Release the trailer spring brakes

Apply the trailer spring brakes

Apply the trailer service brakes

14 / 30

What is the purpose of an anti-compound system in air brakes?

To increase braking power during emergencies

To regulate air dryer purging

To prevent simultaneous service and parking brake application

To speed up parking brake release

15 / 30

What is the purpose of the quick-release valve in an air brake system?

To regulate air compressor output

To stabilize air pressure during braking

To assist the parking brake function

To vent air quickly to release brakes

16 / 30

What is the maximum allowable air loss rate for a combination vehicle during an applied pressure test?

28 kPa (4 psi) in one minute

41 kPa (6 psi) in one minute

55 kPa (8 psi) in one minute

14 kPa (2 psi) in one minute

17 / 30

Trailer couplers or 'glad hands' are usually:

Painted the same color as the vehicle

Color-matched and designed to prevent cross-connection

Cross-connected when colors are matched

Yellow and black to avoid cross-connection

18 / 30

When trial trailer couplers or 'glad hands' are cross-connected:

Trailer service brakes will function correctly

Trailer service and spring brakes will function correctly

Trailer service and spring brakes will not function correctly

The trailer spring brakes will release and function correctly

19 / 30

Why is it important to regularly inspect the slack adjusters?

To increase air tank efficiency

To prevent over-lubrication

To ensure proper brake adjustment

To maintain governor settings

20 / 30

What is spring brake chamber has been disabled by a "caging bolt" or other mechanism:

It still looks the same to a driver

The spring brake is still applying

The spring brake will not apply

The service brake will not apply

21 / 30

A trailer supply valve is usually:

A push/pull type valve located near the driver that supplies air to the trailer

Located in the same position in all commercial vehicles

A toggle-type that supplies air to the trailer and is located at the same position an all vehicles

Pulled to released spring brakes and push to apply service brakes

22 / 30

Which air brake system component prevents air loss when disconnected from a trailer?

Governor

One-way check valve

Tractor protection valve

Relay valve

23 / 30

Air brake chamber pushrod stroke is the result of:

Compressed air entering the brake chamber

Compressed air entering the air tanks

Brakes that are out of adjustment

Moisture entering the air tanks

24 / 30

What is the allowable air pressure drop during a static brake test for a single vehicle?

No more than 55 kPa (8 psi) in one minute

No more than 14 kPa (2 psi) in one minute

No more than 41 kPa (6 psi) in one minute

No more than 28 kPa (4 psi) in one minute

25 / 30

The brake pedal in air brake system is used to:

Apply vehicle service brakes

Apply trailer service brakes only

Apply vehicle spring brake

Raise and lower air brake system pressure

26 / 30

Each air brake chamber style, type and size has a specific:

Mounting position

All the above

Color

Adjustment limit

27 / 30

What safety feature automatically applies the parking brakes if air pressure is too low?

Spring brake chambers

Safety valves

Relay valves

Quick-release valves

28 / 30

Why should air tanks be drained regularly?

To prolong tire life

To prevent brake fading

To increase air pressure efficiency

To remove accumulated moisture and oil

29 / 30

What is the purpose of the service line in an air brake system?

To vent air during quick release

To activate the service brakes

To maintain parking brake pressure

To supply air to the spring brakes

30 / 30

A spring brake control valve is normally:

A push/pull type valve located near the driver

A toggle-type valve located in the same position in all vehicles

Located in the same position in all commercial vehicles

Pulled to release and push to apply the service brakes

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