Home › CDL Practice Tests › Combination Vehicles Questions › Question 59
During uncoupling, in what order do the main steps occur?
- A.Unlock the fifth wheel, lower the gear, disconnect lines, then position the rig
- B.Disconnect lines, unlock the fifth wheel, then lower the gear
- C.Position and secure the rig, lower the landing gear, disconnect lines, unlock the fifth wheel, then pull away in stages
- D.Pull away first, then lower the gear from the tractor
Correct answer
C. Position and secure the rig, lower the landing gear, disconnect lines, unlock the fifth wheel, then pull away in stages
Why
The sequence is built so the trailer is supported and disconnected before the mechanical link is opened. Reversing it, especially unlocking before the gear is down, risks a dropped trailer.
Manual topic: Combination Vehicles - Uncoupling · From the Combination Vehicles practice bank (CV-059).