When must a trailer have its own brakes in Northern Ireland?

A trailer over 750 kg normally requires a working braking system for road use in Northern Ireland.

The Northern Ireland position should be checked against current nidirect/DfI guidance and the NI Highway Code. Nidirect towing guidance states that any trailer weighing over 750 kg must have working brakes, while some lighter trailers also have brakes. The braking system must be maintained in good working order.

For this exact issue — “When must a trailer have its own brakes in Northern Ireland?” — separate four things that are often confused: the entitlement on the NI driving licence, the trailer’s plated MAM, the towing vehicle’s manufacturer limits and the actual laden weight of the combination. Insurance and roadworthiness sit on top of those limits; meeting one figure does not make an otherwise overweight, unbraked or uninsured setup lawful.

Check brakes, breakaway equipment where fitted and coupling condition before every trip, especially after storage. Keep evidence such as photographs, policy wording, vehicle plates or official notices where they could matter later; this is especially useful if an incident, fine or insurance question follows.

Before publishing this answer, the key factual point in “When must a trailer have its own brakes in Northern Ireland?” was checked against current Northern Ireland official guidance. That matters because road rules, licence entitlements and enforcement details can differ from Great Britain and can change over time; the sources attached below are the ones to re-check if the rule is updated.