1 . When leaving your vehicle unattended:

The parking brake must be always be used.
The parking brake should never be used.
Windows in the cab should be lowered.
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2 . If the safety relief valve in the air brake system releases air:

The compressor needs more air.
There is something wrong with the brakes.
You may continue driving.
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3 . Brakes can get out of adjustment quickly, especially:

If they are hot.
In the winter time.
If they are used frequently.
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4 . A safety valve is set to open at ____ pounds per square inch (psi).

100
150
200
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5 . What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.
The brakes may stop working.
The brakes may be sluggish.
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6 . The air storage tanks:

Hold only enough air for one braking cycle.
Hold enough air for the brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
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7 . When leaving a vehicle unattended, a driver should:

Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.
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8 . An alcohol evaporator is especially important:

In cold weather.
In hot weather.
In dry weather.
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9 . An air compressor governor controls:

When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.
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10 . What do the two systems of a dual air brake system share?

Hoses
An air compressor
Air tanks
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11 . Having ABS on only one axle:

Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.
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12 . If using spring brakes when hauling a heavy load, a complete stop will:

Be impossible.
Take a long time.
Take a short amount of time.
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13 . You should test the low pressure warning signal by:

Turning on the engine and applying the trailer hand brake.
Rapidly pressing and releasing the brake pedal.
Removing wheel chocks and disengaging the parking brake.
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14 . When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:

Every three hours.
Every day.
Every other week.
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15 . In a vehicle with dual parking control valves, a separate air tank can be used:

To make the air brakes work more effectively.
To temporarily release the spring brakes.
To charge the brakes on the rear trailer.
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16 . Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.

One half
One third
One fifth
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17 . Air tank drains:

Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.
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18 . Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
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19 . If the safety relief valve in the air brake system releases air:

The compressor needs more air.
The air pressure has become too high.
The brakes are fully operational.
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20 . What is removed when an air tank is drained?

Water and oil
Ammonia
Liquid cleaners
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21 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.

2 psi
4 psi
6 psi
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22 . ABS brakes:

Help you avoid wheel lockup.
Lock up your vehicle's wheels.
Prevent your vehicle from accelerating when going uphill.
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23 . Using the brakes creates heat. If too much heat is produced:

The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.
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24 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to the neutral position.
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25 . When operating a vehicle with a dual air brake system, the driver should:

Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
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