1 . While operating on a downgrade, you should brake until you reach a speed that is:

5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.
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2 . 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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3 . When an S-cam turns inside a brake drum, the S-cam:

Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
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4 . 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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5 . 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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6 . During an applied leakage test, what is the maximum leakage rate that is safe for a single vehicle with air brakes?

10 psi in one minute
5 psi in one minute
3 psi in one minute
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7 . Which of the following is not part of a vehicle’s air brake system?

Air gauges
Low pressure warning device
Air filter
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8 . 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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9 . 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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10 . On flat surfaces, wheel chocks:

Can be used to prevent a parked vehicle from moving.
Make it easier for a parked vehicle to roll.
Should only be used on the front driver's side tire.
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11 . What is often found in compressed air?

Water
Cardboard
Brake fluid
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12 . If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.

55 and 75 psi.
80 and 95 psi.
65 and 100 psi.
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13 . An alcohol evaporator is especially important:

In cold weather.
In hot weather.
In dry weather.
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14 . 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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15 . A slack adjuster should move no more than ____ from where it is attached to the push rod.

Two inches
Five inches
One inch
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16 . When parking, you should not use the parking brake if:

The brakes are very hot.
The brakes are very cold.
There is snow on the ground.
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17 . What color malfunction lamps do vehicles equipped with ABS have?

Green
Yellow
Blue
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18 . 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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19 . 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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20 . Brakes out of adjustment will:

Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
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21 . When traveling down a steep downgrade:

The air brakes should be used.
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.
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22 . What do air brakes use to make the brakes work?

Compressed air
Outside air
Non-compressed air
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23 . 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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24 . 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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25 . 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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