Class 3 Theory Test Practice Questions - NZTA Class 3 Heavy Vehicle Theory Test - Medium Combination Exam

What is the correct sequence for uncoupling a semi-trailer?

Disconnect air lines, release fifth wheel, drive forward Park on level ground, lower landing gear, disconnect red air line first then blue, disconnect electrical, release fifth wheel lock, drive tractor forward slowly Release fifth wheel lock, drive forward, then disconnect lines Disconnect electrical first, then air lines, then release fifth wheel

Correct Answer:

Park on level ground, lower landing gear, disconnect red air line first then blue, disconnect electrical, release fifth wheel lock, drive tractor forward slowly

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