When does the braking action of a trailer with overrun brakes start?

The braking action of a trailer with overrun brakes is designed to enhance safety and stability when towing. In this context, the braking begins when the trailer approaches the towing vehicle, meaning that the trailer's brakes are activated before the truck applies its brakes. This allows for a smoother and more coordinated braking action between both the truck and the trailer.

According to German traffic regulations, this coordinated braking action is crucial as it helps prevent sudden stops that can cause instability or swaying. It ensures that the load is distributed evenly and maintains control over the entire rig, which is especially important in avoiding accidents. Therefore, recognizing when and how the trailer's brakes engage is vital for safe driving with a trailer.