Practice question

Which statement is correct about safe uncoupling?

Pull out before lowering gear
Ignore it if the tractor starts normally
Use the trailer hand valve as the main solution
Safe uncoupling secures the trailer, lowers landing gear on firm ground, relieves fifth wheel pressure, disconnects/stows lines, pulls out slowly, and verifies trailer stability.

Answer: D — Safe uncoupling secures the trailer, lowers landing gear on firm ground, relieves fifth wheel pressure, disconnects/stows lines, pulls out slowly, and verifies trailer stability.

The correct answer is shown above. Try the full quiz for additional practice.