CDL Air Brakes Practice Test - Missouri
16.
When going down grades, you should:
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downshift to a lower gear.
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shift up.
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put the transmission in Neutral.
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17.
It may not be safe to operate at legal maximum weights:
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in hot weather.
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during bad weather or in mountains.
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on two-way streets.
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18.
The most common foundation brakes found on vehicles with air brakes are the:
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wedge brakes.
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disc brakes.
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S-cam brakes.
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19.
If the low pressure warning signal doesn't work:
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this could cause sudden emergency braking in a single-circuit air system.
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you could lose air pressure and you would know it.
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None of the above.
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20.
To check the slack adjusters:
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park downhill and see if the vehicle rolls.
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Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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