Correct answer: D. 750 kg
Brakes must be fitted to a trailer if its gross vehicle weight exceeds either 750 kg or half the weight of the towing vehicle.
This is an official-style question from the Technical Matters topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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