SD CDL AIR BRAKES PRACTICE TEST

21. Do NOT use the parking brakes:
if the brakes are very hot.
when you park for less than two hours.
when you leave your vehicle.
to test that they work.
22. Front-end header boards:
protect drivers from spilled cargo.
protect drivers from cargo in case of an accident or emergency stop.
should never be used.
reduce traction.
23. The one-way check valve:
keeps air from going out if the air compressor develops a leak.
keeps your wheels from locking up when you brake hard.
keeps the axles in place.
supplies air to the trailer air tanks.
24. When driving in hot weather, drivers should inspect tires:
every 2 hours or every 100 miles.
every 4 hours or every 200 miles.
every 3 hours or every 75 miles.
every hour or every 50 miles.
25. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
less; more
greater; more
less; less
greater; less
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