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

The braking action of a trailer with overrun brakes is designed to initiate when the trailer runs up to the truck. This mechanism allows the trailer to react promptly to the braking of the towing vehicle. In this system, the trailer's brakes engage almost simultaneously as the towing vehicle begins to decelerate, ensuring that both units act in unison during braking.

Understanding the timing and operation of overrun brakes is crucial for safe towing, as it helps to prevent situations where the trailer could push against the truck, leading to instability or loss of control. Selecting the relevant options in the quiz reflects a comprehensive understanding of the mechanics involved in trailer towing as regulated by German traffic laws.