1 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is:

10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.
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2 . In a vehicle with dual air brakes, what happens if one system is low on pressure?

The air from the other system will be used to supplement the system with the low pressure.
The front or rear brakes may not work properly.
All brakes will be inoperable.
The low system will use an auxiliary system to fill the tank.
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3 . 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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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 . Failing to drain the tanks in an air brake system can result in:

Water freezing and causing brake failure.
Squishy brakes.
Too much air collecting.
Too much fuel being carried.
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6 . Using an Anti-Lock Braking System (ABS):

Shortens stopping distance.
Shortens brake response time.
Provides less control.
Provides more control.
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7 . In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.
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8 . In a dual air brake system, a leak in one system:

Always means there are leaks in both systems.
May not affect the other system.
Is not something to worry about.
Will also affect the other system.
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9 . Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
GPS.
A rear back-up camera.
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10 . 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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11 . Emergency brakes are:

Not required on trucks.
Only required on trailers.
Required on tractors.
Only required when transporting hazardous materials.
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12 . Braking mechanisms are located ____ a brake drum.

Outside
Inside
Next to
On top of
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13 . Friction inside a brake drum is caused when the brake shoes and linings:

Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.
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14 . If using the spring brakes while hauling a heavy load, a complete stop will:

Be impossible.
Take a long time.
Take a short amount of time.
Damage the brakes.
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15 . 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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16 . The safety valve located on the first tank opens:

Regularly.
If there is too little pressure.
If there is too much pressure.
After every stop.
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17 . 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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18 . The application pressure gauge:

Shows how much air pressure is being applied to the brakes.
Shows the temperature of air being used in the braking system.
Shows the pressure of the air coming from the compressor.
Shows the number of times the brakes have been used.
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19 . If you’re driving and the ABS warning light comes on, it means:

The ABS is working properly.
The ABS has just been activated.
The ABS is not working properly.
The ABS needs to be activated.
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20 . Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.
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21 . Which part of the truck is the air compressor connected to?

The transmission
The engine
The radiator
The door latch
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22 . How many air storage tanks are used in an air brake system?

Two tanks
Four tanks
Six tanks
The number varies.
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23 . When traveling down a steep downgrade:

The air brakes should be used.
Shift into a lower gear, then use brakes to supplement the braking effect of the engine.
The vehicle should be continually downshifted in the place of using the brakes.
The vehicle should be driven on the shoulder.
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24 . 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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25 . To stop a vehicle using air brakes:

The brake pedal should be pressed.
The brake pedal should be lifted.
The brake knob should be pulled out.
The brake knob should be pushed in.
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