Truck Test 4

1.When you want to apply the trailer brakes without applying the tractor brakes, what should you use?

The foot valve

The trailer air supply valve

The hand valve

Any of these

Correct! Wrong!

Progress
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Truck Test 4

2.Automatic slack adjusters need to be checked…?

More often than manual adjusters

Less often than manual adjusters

Only during servicing

As often as manual adjusters

Correct! Wrong!

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Truck Test 4

3.In a Type 30 brake chamber, the maximum available stroke is…?

0.5 inches

1.5 inches

3.5 inches

2.5 inches

Correct! Wrong!

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Truck Test 4

4.A tractor with a bobtail proportioning system will reduce the braking pressure to the drive axle brakes by up to…?

10%

25%

50%

75%

Correct! Wrong!

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Truck Test 4

5.The trailer air supply knob on the dashboard will usually be what shape?

Circle

Square

Hexagon

Octagon

Correct! Wrong!

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Truck Test 4

6.Your vehicle will have automatic slack adjusters if it was built later than…?

1976

1986

1996

2006

Correct! Wrong!

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Truck Test 4

7.Which of these statements is most accurate regarding poorly adjusted brakes?

You may not notice poor adjustment in normal operation

It is safe to use poorly adjusted brakes in normal operation

Poorly adjusted brakes will work normally if you increase pedal pressure

You will immediately notice poor adjustment

Correct! Wrong!

Progress
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Truck Test 4

8.If a vehicle is equipped with a tractor parking brake valve, it will usually be what colour?

Green button

Yellow button

Red button

Blue button

Correct! Wrong!

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Truck Test 4

9.On which of these vehicles are you most likely to find air over hydraulic brakes?

A heavyweight truck

A bus

A crane towing vehicle

A heavyweight emergency response vehicle

Correct! Wrong!

Progress
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Truck Test 4

10.If your vehicle has wedge brakes, you will know the automatic adjusters have failed if when the brakes are applied and released the linings move more than…?

1/4 of an inch

1/8 of an inch

1/16 of an inch

1/32 of an inch

Correct! Wrong!

Progress
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Truck Test 4

11.An application pressure gauge shows what?

The pressure being delivered to the brakes

The pressure in the compressor

The pressure in the supply tank

The pressure in the secondary tank

Correct! Wrong!

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Truck Test 4

12.Which of these people is ultimately responsible for making sure air brakes are working properly?

State inspection officials

The company mechanic

The vehicle driver

The vehicle owner

Correct! Wrong!

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Truck Test 4

13.When stopping on slippery surfaces with an ABS equipped truck, how should you apply the brake pedal?

With intermittent pressure

With as much pressure as possible

With light pressure

With firm continuous pressure

Correct! Wrong!

Progress
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Truck Test 4

14.The vast majority of brake failures are caused by what?

Poor driving

Road debris

Poor maintenance/checking

Mechanical defects

Correct! Wrong!

Progress
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Truck Test 4

15.Operating a vehicle with an excessive brake chamber pushrod stroke can result in a fine of up to…?

$1500

$1000

$2000

$2500

Correct! Wrong!

Progress
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Truck Test 4

16.Alcohol injector systems are designed to prevent…?

Freezing

Rusting

Excessive moisture

All of these

Correct! Wrong!

Progress
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Truck Test 4

17.When checking adjustment, you should wear…?

Eye protection

Stout clothing

A hard hat

All of these

Correct! Wrong!

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Truck Test 4

18.By law, you must check the manual and automatic slack adjusters…?

Every day

Every 1000 miles

Every two days

Once a week

Correct! Wrong!

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Truck Test 4

19.Before manually releasing spring brakes, you should do what?

Turn on the engine

Chock the wheels

Presserise the air system

Attach the vehicle to a tow truck

Correct! Wrong!

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Truck Test 4

20.The couplers between tractor and trailer are known as what?

No hands

Third hands

Extra hands

Glad hands

Correct! Wrong!

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Truck Test 4

21.When not in use, glad hand couplers should be blocked with dead-end couplers or if these are not available they should be…?

Secured upright

Blocked with rags

Left venting air

Connected to each other

Correct! Wrong!

Progress
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Truck Test 4

22.What force does the coil spring in spring parking brake chambers exert?

1000 – 1500 lbs

1500 – 2000 lbs

2000 – 2500 lbs

2500 – 3000 lbs

Correct! Wrong!

Progress
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Truck Test 4

23.How are safety actuator parking brakes different from normal brake systems?

The brake chamber operates hydraulically

The parking brakes operate automatically

The brake chamber has two springs

The brake chamber has two diaphragms

Correct! Wrong!

Progress
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Truck Test 4

24.The chief difference between a trailer air brake system compared to the tractor is that the trailer will not have…?

Foundation brakes

Air reservoirs

Control valves

A compressor

Correct! Wrong!

Progress
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Truck Test 4

25.Releasing a spring parking brake manually is known as what?

Boxing

Unlocking

Forcing

Caging

Correct! Wrong!

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Truck Test 4

26.The parking brake control valve on the dashboard is usually which colour?

Blue

Yellow

Green

Red

Correct! Wrong!

Progress
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Truck Test 4

27.Which of these is an alternative name for the control line?

Primary line

Service line

Emergency line

Supply line

Correct! Wrong!

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Truck Test 4

28.When trailer brakes "dynamite" they will remain applied for how long?

10 minutes

5 minutes

15 minutes

20 minutes

Correct! Wrong!

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Truck Test 4

29.The trailer air supply valve must close if the tractor pressure drops below…?

10 psi

15 psi

20 psi

25 psi

Correct! Wrong!

Progress
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Truck Test 4

30.Using foundation brakes to hold the vehicle when parked is…?

Illegal

Dangerous

Unreliable

All of these

Correct! Wrong!

Progress
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Truck Test 4

31.In dual air brake systems using blended air, the parking brake will take air from…?

Each tank alternately

The tank with the lowest pressure

Directly from the compressor

The tank with the highest pressure

Correct! Wrong!

Progress
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Truck Test 4

32.In a typical Type 30 chamber, an air pressure of 100 psi will deliver a force on the pushrod of what?

2500 lbs

2000 lbs

3000 lbs

3500 lbs

Correct! Wrong!

Progress
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Truck Test 4

33.If your compressor is belt driven, when you press down on the belt midway between the pulleys, you should not be able to push it in more than…?

Four times the width of the belt

Twice the width of the belt

The width of the belt

Three times the width of the belt

Correct! Wrong!

Progress
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Truck Test 4

34.What do the one-way check valves on a dual air brake system control?

Airflow between the primary and secondary reservoirs

Airflow to the secondary reservoir

Airflow to the primary reservoir

Airflow to the primary and secondary reservoirs

Correct! Wrong!

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Truck Test 4

35.The supply reservoir is also known as…?

The dry tank

The wet tank

The cold tank

The hot tank

Correct! Wrong!

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Truck Test 4

36.The safety valve is sometimes referred to as what?

Pop off valve

Drop off valve

Hop off valve

Chop off valve

Correct! Wrong!

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Truck Test 4

37.A dual brake system has brakes controlled by…?

Two pedals

A pedal and a handbrake

A single pedal

Any of these depending on the manufacturer

Correct! Wrong!

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Truck Test 4

38.Which of these is not part of an air brake chamber?

Diaphragm

Pushrod

Two-way valve

Return spring

Correct! Wrong!

Progress
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Truck Test 4

39.In most systems the primary section of a dual air brake system controls what?

Trailer axle brakes

Steering axle brakes

Drive axle brakes

None of these

Correct! Wrong!

Progress
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Truck Test 4

40.When an air pressure warning is given, what should you do?

Make a note to report it to a mechanic

Drive more cautiously

Stop and check for the cause immediately

Inspect the system at your next scheduled stop

Correct! Wrong!

Progress
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Truck Test 4

41.A relay valve is installed to reduce what?

Lag time

Drum wear

Brake fade

Excess pressure

Correct! Wrong!

Progress
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Truck Test 4

42.The mechanical parts of the brake system inside the wheel are known as what?

Basic brakes

Axle brakes

Wheel brakes

Foundation brakes

Correct! Wrong!

Progress
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Truck Test 4

43.The air pressure gauge for the system will be found where?

On the dashboard

On the compressor

By the front brake

On the supply tank

Correct! Wrong!

Progress
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Truck Test 4

44.The low air pressure warning device must come on when the air pressure drops below what level?

50 psi

60 psi

40 psi

70 psi

Correct! Wrong!

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Truck Test 4

45.How often should you check air pressure gauges on a trip?

At the beginning and end

Occasionally

Frequently

At every stop

Correct! Wrong!

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Truck Test 4

1.When you want to apply the trailer brakes without applying the tractor brakes, what should you use?

Progress 01/45

Truck Test 4

2.Automatic slack adjusters need to be checked…?

Progress 02/45

Truck Test 4

3.In a Type 30 brake chamber, the maximum available stroke is…?

Progress 03/45

Truck Test 4

4.A tractor with a bobtail proportioning system will reduce the braking pressure to the drive axle brakes by up to…?

Progress 04/45

Truck Test 4

5.The trailer air supply knob on the dashboard will usually be what shape?

Progress 05/45

Truck Test 4

6.Your vehicle will have automatic slack adjusters if it was built later than…?

Progress 06/45

Truck Test 4

7.Which of these statements is most accurate regarding poorly adjusted brakes?

Progress 07/45

Truck Test 4

8.If a vehicle is equipped with a tractor parking brake valve, it will usually be what colour?

Progress 08/45

Truck Test 4

9.On which of these vehicles are you most likely to find air over hydraulic brakes?

Progress 09/45

Truck Test 4

10.If your vehicle has wedge brakes, you will know the automatic adjusters have failed if when the brakes are applied and released the linings move more than…?

Progress 010/45

Truck Test 4

11.An application pressure gauge shows what?

Progress 011/45

Truck Test 4

12.Which of these people is ultimately responsible for making sure air brakes are working properly?

Progress 012/45

Truck Test 4

13.When stopping on slippery surfaces with an ABS equipped truck, how should you apply the brake pedal?

Progress 013/45

Truck Test 4

14.The vast majority of brake failures are caused by what?

Progress 014/45

Truck Test 4

15.Operating a vehicle with an excessive brake chamber pushrod stroke can result in a fine of up to…?

Progress 015/45

Truck Test 4

16.Alcohol injector systems are designed to prevent…?

Progress 016/45

Truck Test 4

17.When checking adjustment, you should wear…?

Progress 017/45

Truck Test 4

18.By law, you must check the manual and automatic slack adjusters…?

Progress 018/45

Truck Test 4

19.Before manually releasing spring brakes, you should do what?

Progress 019/45

Truck Test 4

20.The couplers between tractor and trailer are known as what?

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Truck Test 4

21.When not in use, glad hand couplers should be blocked with dead-end couplers or if these are not available they should be…?

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Truck Test 4

22.What force does the coil spring in spring parking brake chambers exert?

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Truck Test 4

23.How are safety actuator parking brakes different from normal brake systems?

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Truck Test 4

24.The chief difference between a trailer air brake system compared to the tractor is that the trailer will not have…?

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Truck Test 4

25.Releasing a spring parking brake manually is known as what?

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Truck Test 4

26.The parking brake control valve on the dashboard is usually which colour?

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