OHIO CDL AIR BRAKES PRACTICE TEST
16.
Your vehicle has a dual air brake system. If one air system is very low on pressure, you should:
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call your dispatcher or supervisor for instructions.
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bring the vehicle to a safe stop, and have the air brakes system fixed.
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reduce your speed and check the low air pressure warning signal for the other system regularly.
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17.
Before leaving your vehicle unattended, you should:
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Apply the parking brake.
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Remove the keys.
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All of the above.
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18.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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at 30 psi.
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if there is too little pressure.
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if there is too much pressure.
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19.
As part of the final air brake check, you should:
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Check air compressor governor cut-in and cut-out pressure.
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Test air leakage rate.
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All of the above.
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20.
Most heavy-duty vehicles use:
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single air brake systems.
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dual air brake systems.
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triple air brake systems.
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