1 . Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:

Air pressure falls below 45 psi.
Air pressure falls below 20 psi.
Driving downhill.
Driving uphill.
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2 . Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.
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3 . Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:

An extra set of brakes.
Voice-activated brakes.
Cruise control.
Anti-Lock Braking Systems (ABS).
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4 . Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:

Are necessary for the proper function of the air brake system.
Should be added if low.
Should be removed regularly.
Are not concerns.
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5 . What happens if brakes become too hot?

They will become too smooth.
They will harden.
They may stop working.
The air compressor will kick in to cool the brakes
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6 . 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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7 . All air tanks must include:

A drain valve.
A lock.
A trap door.
A warning sticker.
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8 . What kind of force must emergency brakes use?

Air pressure
Mechanical
Heavy
Electrical
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9 . An air brake-equipped vehicle traveling at a speed of 55 mph under ideal driving conditions will need approximately ____ to come to a complete stop.

100 feet
250 feet
300 feet
450 feet
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10 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air braking systems are very effective.
Air brakes are complicated.
Air is free.
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11 . Pressing and releasing the brake pedal unnecessarily can:

Release air faster than it can be replaced.
Add more air to a brake system.
Make the brake pedal harder to depress.
Create a loud noise.
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12 . A tank endorsement is:

Only required when transporting gases.
Only required when transporting liquids.
Required when transporting both liquids and gases.
Optional when transporting hazardous materials.
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13 . An Anti-Lock Braking System (ABS):

Cannot be used with air brakes.
Should be used on dry pavement.
Can assist in maintaining control when braking.
Should only be used if all axles have ABS.
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14 . To inspect slack adjusters on S-cam brakes, you need to:

Park on a hill and test the brakes.
Put on gloves and push in the slack adjusters.
Remove the drum and look inside.
Chock the wheels and disengage the parking brake.
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15 . The 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 air pumped into the air storage tanks.
The speed of the vehicle.
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16 . 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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17 . The air entering air storage tanks may contain:

Water and compressor oil.
Frost.
Gravel.
Antifreeze.
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18 . 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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19 . Air brakes are:

An effective tool for stopping large vehicles.
Prohibited on large vehicles.
Only effective in poor weather.
A tool to improve fuel efficiency.
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20 . When the brake pedal is pushed down, air brakes work:

Immediately.
After a short delay.
After about a minute.
Only if it is warm outside.
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21 . Anti-Lock Braking Systems (ABS):

Reduce normal braking capacity.
Are equipped in addition to other braking systems and do not reduce normal braking power.
Are not effective on larger vehicles.
Are illegal in some states.
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22 . Front wheel braking works:

Only on packed snow.
Under all conditions.
Only if the road is dry.
Under most conditions.
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23 . In a newer vehicle, you apply the parking brake:

By using a diamond-shaped yellow knob.
By using a round red knob.
By using a square green knob.
By using a black round knob.
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24 . Foundation brakes are used:

Only at the front wheels.
Only at the rear wheels.
Only at the driver’s side wheels.
At each wheel.
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25 . What can happen if parking brakes are used in very wet weather with temperatures below freezing?

The brakes will squeak.
The brakes may freeze so the vehicle cannot move.
The brakes may suddenly release by themselves.
The brakes may become too smooth to be used.
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