Arizona CDL Air Brakes: Practice Test - Practice Test 2
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Air storage tanks:
Are not allowed on a vehicle.
Hold compressed air for the brakes.
Should be drained of excess air after every trip.
The parking brake in a newer vehicle is applied by:
Moving a lever to the right.
Pushing a yellow, diamond-shaped knob.
Pulling a yellow, diamond-shaped knob.
What helps prevent wheel lockup when braking?
An Anti-Lock Braking System (ABS)
Air brakes
An alternator
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.
In a dual air brake system, if one air system is very low on pressure:
None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.
What kind of force do emergency brakes use?
Air pressure
Mechanical
Heavy
When leaving a vehicle unattended, a driver should:
Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
Slack adjuster
One-way check valve
Tractor protection valve
Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:
Are necessary for the proper function of the system.
Should take up about 10 percent of the tank.
Should be removed regularly.
Failing to drain air tanks could result in:
Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.
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