CDL AIR BRAKES PRACTICE TEST - MARYLAND
6.
In a dual air brake system, if one air system is very low on pressure:
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you should pump the brakes to restore pressure.
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the effect won't be noticeable for the first 50 miles.
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you should drive and brake as you always have.
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either the front or rear brakes will not be operating fully.
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7.
With a fully-charged air system, the leakage rates should be less than:
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2 psi for single vehicles and 3 psi for a combination of two vehicles.
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5 psi for single vehicles and 10 psi for a combination of two vehicles.
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5 psi for single vehicles and 4 psi for a combination of two vehicles.
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3 psi for single vehicles and 4 psi for a combination of two vehicles.
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8.
The tractor protection valve:
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will close automatically if the air pressure drops to a certain level.
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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All of the above.
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9.
Emergency brakes are:
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not required on doubles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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required on all vehicles.
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10.
If an aggressive driver is involved in an accident down the road, you should:
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make eye contact with the driver.
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try to get their vehicle to the side of the road.
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confront the aggressive driver.
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stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
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