1 . Foundation brakes are used:

Only on the front wheels of a vehicle.
Only on the rear wheels of a vehicle.
On each wheel of a vehicle.
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2 . The leakage rate for a single vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

1 psi
2 psi
3 psi
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3 . A low air pressure warning signal:

Is not recommended on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.
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4 . 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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5 . Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:

Are necessary for the proper function of the system.
Should take up about 10 percent of the tank.
Should be removed regularly.
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6 . Air storage tanks:

Are not allowed on a vehicle.
Hold compressed air for the brakes.
Should be drained of excess air after every trip.
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7 . 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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8 . The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:

Presses the brake pedal.
Uses the emergency brake.
Uses the trailer hand valve.
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9 . Air pressure should build up in a single air system within:

15 minutes.
12 minutes.
Three minutes.
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10 . If the low air pressure warning signal comes on, you should:

Continue driving, but have the brakes repaired within a week.
Pull over and inspect the brakes.
Phone a mechanic while driving.
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11 . What color light indicates a vehicle's ABS is not working?

Green
Blue
Yellow
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12 . 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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13 . Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.
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14 . What is brake lag?

The time required for the brakes to work after the brake pedal is pressed
The distance between the brake pedal and the floor
The amount of air pressure used to stop the vehicle
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15 . Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.

Green
Blue
Yellow
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16 . A wig wag is:

A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.
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17 . 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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18 . Friction in an S-cam brake is caused when the brake shoes and linings:

Press against the outside of the brake drum.
Press against the inside of the brake drum.
Push against each other.
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19 . What should happen before the air pressure in an air brake system tank falls below 55 psi?

The warning light should activate.
The vehicle will be unable to shift out of gear.
The front lights should flash.
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20 . What does an air compressor do in an air brake system?

It pumps air into the air storage tanks.
It fills the tires.
It moves air to the back of the truck.
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21 . The ____ are activated by an electric switch that is triggered by the brake pedal.

Headlights
Turn signals
Brake lights
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22 . The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

8 psi
5 psi
3 psi
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23 . Manual air tank drains should be:

Opened to drain the tanks after each day.
Left open while driving.
Sealed with glue.
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24 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.
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25 . Air tank drains should:

Not be used by the driver.
Only be used when it is wet outside.
Be used to drain the tanks completely.
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