1 . The most common type of foundation brake used is the:

S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.
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2 . If the low pressure warning signal activates while you are driving, you should:

Continue driving normally.
Exit the road and park as soon as safely possible.
Stop where you are and park.
Put on your hazard lights and continue driving.
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3 . 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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4 . 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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5 . 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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6 . The air entering air storage tanks may contain:

Water and compressor oil.
Frost.
Gravel.
Antifreeze.
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7 . The ____ tells a driver how much pressure is in the air tanks.

Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake
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8 . When parked on a flat surface, you should:

Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.
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9 . To confirm that a trailer has ABS, you can:

Look under the trailer for wheel speed sensors coming from the back of the brakes.
Look under the hood for the ABS sticker.
Look at the tires.
Remove a tire and look for the ABS sensor on the axle.
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10 . If the brake pads rub against the brake drums and create too much heat:

The brakes will stick.
The brakes will become extra sensitive.
The brakes may stop working.
The air compressor will kick on to cool the brakes.
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11 . 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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12 . Braking mechanisms are located ____ a brake drum.

Outside
Inside
Next to
On top of
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13 . Air pressure should build up in a single air system within:

15 minutes.
12 minutes.
Three minutes.
One minute.
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14 . In a dual air brake system:

Air tanks are shared by both systems.
Each system has its own air tanks.
You must designate which system you are using.
Brakes on only one side of the vehicle will work.
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15 . 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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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 . 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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18 . Where is the safety relief valve usually located?

Near the rear brake
Near the front brake
In an air tank
On the dashboard
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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 . The air storage tanks:

Hold only enough air for one braking cycle.
Hold enough air for brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
Hold enough air for more than 1,000 braking cycles.
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21 . Emergency brakes are:

Not required on trucks.
Only required on trailers.
Required on tractors.
Only required when transporting hazardous materials.
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22 . Test the low pressure warning signal:

Once a month.
Once a week.
Twice a week.
Before every trip.
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23 . What helps prevent wheel lockup when braking?

An Anti-Lock Braking System (ABS)
Air brakes
An alternator
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24 . 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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25 . If the low pressure warning light comes on while you are driving:

Braking will only be possible if there is still enough air in the tanks.
You can apply the brakes 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should stay at least 100 feet away from other vehicles.
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