What should you do if the trailer brakes release unexpectedly while parked?

When the trailer brakes release unexpectedly while parked, chocking the trailer is the primary and most effective method to ensure safety. Chocks are wedge-shaped devices that are placed against the wheels to prevent any movement of the trailer. This is crucial because an unbraked trailer can roll away, posing significant hazards to both the vehicle and any individuals nearby.

By chocking the trailer, you secure it in place, minimizing the risk of an accident caused by unexpected movement. It is a proactive safety measure that guarantees the stability of the trailer until the issue can be assessed and addressed properly.

While checking the emergency line or calling for assistance may be steps taken later on, they don't provide an immediate solution to the potential hazard posed by the trailer’s movement. Driving away quickly would greatly increase the risk of an accident. Therefore, securing the trailer with chocks is the first and most crucial step to ensure safety in this situation.