What is the breakaway cable used for, and when does it need replacing?

Trailers fitted with a brake system require a breakaway cable. This connects the overrun brake system to the towing vehicle and activates the brake should the trailer become detached from the coupling whilst in motion. A sheathed steel cable approximately 1 m in length, fitted with a snap hook, is standard.

How to attach it correctly: to a fixed point on the towing vehicle, not to the ball neck itself — otherwise the cable will slip off when the coupling is released. It must not drag on the ground, but nor should it be so short that it activates the brake when cornering.

Unbraked trailers have a safety connection made of rope or chain instead of a breakaway cable, which only prevents the drawbar from falling down.

When to replace: Breakaway cables are wear parts. A frayed outer sheath, visible rust, broken strands or a bent or stiff carabiner mean: replace. The cable is also checked during the annual roadworthiness test.

Choose from: Breakaway cables.