1 . Some air brake systems use alcohol:

To reduce the risk of ice forming in air brake valves.
To make the compressor run more efficiently.
To lubricate parts of the braking system.
To reduce the risk of rust forming on air brake valves.
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2 . Air tank drains:

Allow rain water to enter air tanks.
Are used to drain water and oil from air tanks.
Should never be opened.
Must remain open while driving.
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3 . ____ make up the emergency brake system.

Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems
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4 . In a dual air brake system:

Each system has separate air tanks, hoses, and lines.
The systems share air tanks, but each has its own separate hoses and lines.
Each system uses the same lines and hoses.
One system is the main braking system and a second system is ready to be used if the first one fails.
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5 . Brake linings should be:

Loose.
Free of oil.
Soft.
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6 . Why do you need to drain air tanks regularly?

Because the air gets old and needs to be replaced
Because compressed air contains some water which must be drained from the tanks
To allow for a change in air pressure
To remove bad air from the tanks
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7 . The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.

Slack adjuster
One-way check valve
Tractor protection valve
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8 . Emergency brakes:

Are not required on vehicles with air brakes.
Are required only on buses.
Are required on all vehicles.
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9 . 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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10 . How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?

300 feet
100 feet
450 feet
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11 . A low air pressure warning signal:

Is not required on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.
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12 . A ____ allows a driver to gradually apply spring brakes.

Modulating control valve
Trailer air supply control
Relay valve
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13 . The air pressure in a dual air brake system should build from 85 to 100 psi within:

Two minutes.
15 seconds.
10 minutes.
45 seconds.
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14 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
When tank pressure falls below 5 psi.
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15 . Air tank drains:

Allow rain water to enter the tanks.
Are used to drain water and oil from the air tanks.
Should never be opened.
Must remain open while driving.
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16 . 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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17 . A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.

Green
Yellow
Orange
White
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18 . If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.

32 feet
15 feet
50 feet
10 feet
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19 . To make a stop in a vehicle equipped with air brakes, the driver should:

Press the brake pedal down.
Lift the brake pedal up.
Pull out the air brake knob.
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20 . The brake pedal is part of which braking system?

The service brake system
The parking brake system
The emergency brake system
The auxiliary brake system
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21 . During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

One half
One quarter
One third
One tenth
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22 . Front brake limiting valves were intended to:

Prevent the front tires from skidding.
Prevent the front tires from overheating.
Create equal brake usage.
Remove uncertainty when applying the brakes.
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23 . Dollies equipped with ABS are required to have malfunction lamps located where?

On the rear
On the left side
On the front
On the top
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24 . 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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25 . When leaving your vehicle unattended:

The parking brake should be used.
The parking brake only needs to be used if the vehicle is parked on a slope.
The parking brake should not be used, as it can damage the tires.
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