Washington CDL Practice Test

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In a combination pre-trip, the area between the back of the cab and the front of the trailer (coupling area) requires inspection of:

Only the air lines Fifth wheel mounting, kingpin and apron, locking jaws, gap, air and electric lines, mud flaps Only the fifth wheel lubrication Only the kingpin

Correct Answer:

Fifth wheel mounting, kingpin and apron, locking jaws, gap, air and electric lines, mud flaps

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