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Driving Test
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Driving Test
Missouri
Missouri CDL Air Brakes 2
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Q.1
Submit
Air brakes use ____ to function.
Compressed air
Liquid air
Nitrogen
Q.2
Submit
The two markings on a front brake limiting valve usually read:
"Normal" and "slippery."
"Low" and "high."
"Left" and "right."
Q.3
Submit
A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch
Q.4
Submit
When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:
Every three hours.
Every day.
Every other week.
Q.5
Submit
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.
Q.6
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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
Q.7
Submit
Air tank drains should:
Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.
Q.8
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Why should you regularly drain the air tanks?
Because the air gets old and needs to be replaced
Because compressed air contains some water and the water collects in the tanks
To allow for a change in pressure
Q.9
Submit
Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.
Q.10
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A ____ allows a driver to gradually apply spring brakes.
Modulating control valve
Trailer air supply control
Relay valve
Q.11
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What do the two systems of a dual air brake system share?
Hoses
An air compressor
Air tanks
Q.12
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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
Q.13
Submit
What kind of force do emergency brakes use?
Air pressure
Mechanical
Heavy
Q.14
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Brake linings should be:
Loose.
Free of oil.
Soft.
Q.15
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Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
Q.16
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If the safety relief valve in an air brake system is releasing air:
You should not be concerned as this is a normal process.
There is something wrong with the brakes.
The valve is operational.
Q.17
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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.
Q.18
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To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to the neutral position.
Q.19
Submit
During an inspection, slack adjusters on S-cam brakes should not move more than:
One foot.
One centimeter.
One inch.
Q.20
Submit
The air compressor is connected to the:
Transmission.
Engine.
Radiator.
Q.21
Submit
An application pressure gauge shows:
How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.
Q.22
Submit
Using an Anti-Lock Braking System (ABS):
Is required in some states.
Shortens brake response time.
Provides additional control.
Q.23
Submit
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.
Q.24
Submit
Failing to drain air tanks could result in:
Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.
Q.25
Submit
If using spring brakes when hauling a heavy load, a complete stop will:
Be impossible.
Take a long time.
Take a short amount of time.
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