What is the correct protocol for uncoupling a trailer?

What is the correct protocol for uncoupling a trailer?

• A. Uncouple while moving
• B. Stop, set parking brakes, chock wheels, unlock the trailer coupler, and lower landing gear if necessary.
• C. Disconnect while brakes on
• D. Leave it to float away

Answer: (B)

Safely uncoupling a trailer requires securing both units and providing support before separation. Stop the vehicle, apply the tractor’s parking brakes, and place wheel chocks to prevent any movement. Then unlock the trailer coupler so the kingpin can be released, and lower the landing gear if needed to support the trailer once it’s detached. This sequence keeps the trailer from rolling away and gives a stable base so you can safely separate the tractor from the trailer. Uncoupling while moving, or disconnecting with brakes not secured, or leaving the setup to float away, creates immediate hazards and is not how this should be done.

Safely uncoupling a trailer requires securing both units and providing support before separation. Stop the vehicle, apply the tractor’s parking brakes, and place wheel chocks to prevent any movement. Then unlock the trailer coupler so the kingpin can be released, and lower the landing gear if needed to support the trailer once it’s detached. This sequence keeps the trailer from rolling away and gives a stable base so you can safely separate the tractor from the trailer. Uncoupling while moving, or disconnecting with brakes not secured, or leaving the setup to float away, creates immediate hazards and is not how this should be done.