When the towbar is disconnected from the tow tractor for repositioning, which action ensures stability?

• A. Turn off the tractor
• B. Apply parking brake only
• C. Set brakes and install chocks
• D. Remove the towbar

Answer: (C)

Stability comes from preventing any wheel movement. When the towbar is detached for repositioning, you must immobilize the tow tractor by applying the braking system to lock the wheels and by placing wheel chocks to create a physical barrier that blocks motion. The brakes minimize rotation and slowing forces, while the chocks resist any rolling that could occur if the brakes slip or if there’s a slope or uneven surface. This dual approach keeps the vehicle from shifting during repositioning. Turning off the tractor alone doesn’t guarantee brakes are engaged, and a parking brake can fail or be insufficient in some conditions. Removing the towbar removes the towing connection but doesn’t stop the tractor from moving on its own wheels.