Same direction both sides to tighten ( flicking handle of adjuster tool downwards ) till they lock, then opposite way to loosen ( lifting handle of adjuster tool upward) 10 turns then spin hub if grabbing loosen off couple more turns. Apply 12 volt to brakes after adjustment to check hub locks on, remove power then spin again to make sure adjustment is ok.
12 inch hubs are heavy as mentioned yes mechanic should have picked up if there an issue if they were checked. Caravan repairs place most definately vehicle mechanics I’m unsure.



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