Overrun brakes and what they mean for recovery
Most caravans and light trailers are fitted with overrun brakes (also called inertia brakes). When the towing vehicle brakes, the trailer's drawbar compresses against the coupling. That compression actuates the trailer's own braking system. The brakes apply proportionally to the deceleration, the harder the tow vehicle brakes, the harder the trailer brakes.
For a recovery operator, overrun brakes complicate the load: the trailer's brakes must be manually released before the unit can be loaded onto a flatbed or moved by a wheel-lift. Most operators carry a snatch block or a release tool for common coupling types (AL-KO, Bradley, Knott). If the operator is unfamiliar with the coupling type, the trailer's brakes may lock during loading and damage the brake mechanism.
Tell the dispatcher the coupling type and caravan model when booking. A caravan with a broken or seized overrun brake is a specialist lift, the operator may need a dolly or a winch with controlled tension rather than a straight pull.
