ND CDL Air Brakes Practice Test
21.
The air compressor governor controls:
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the air pressure applied to the brakes.
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the speed of the air compressor.
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when the air compressor will pump air into the air storage tanks.
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when air tank pressure falls below the “cut-out” level.
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22.
Before driving a vehicle with a dual brake brake system, the driver should:
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wait at least 5 minutes before driving.
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pump the brake pedal 10 times to build pressure.
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wait at least 10 minutes before driving.
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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23.
If your vehicle has an alcohol evaporator, every day during cold weather, you should:
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check the alcohol container and fill up as necessary.
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fill it up with oil to prevent the pipes from freezing.
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ensure that compressed air usually has some water and some compressor oil in it.
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fill it up with oil to prevent alcohol from freezing.
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24.
Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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shifting into neutral may help slow the vehicle.
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the parking brake should never used to slow the vehicle.
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All of the above.
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25.
With a dual air brake system:
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one system is the main braking system while the other is a back-up system.
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each system shares air tanks.
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each system has its own air tanks, hoses and lines.
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each system shares the same lines and hoses.
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