Mercury - MerCruiser Bravo Three 300 Hour Maintenance Kit Precision Sterndrive Service Kit Marine-Ready Components 8M0147076. Overview. There's a certain trust that builds over time with a Bravo Three drive - the kind that comes from countless smooth shifts, clean acceleration and steady handling even when the water turns unpredictable. When you run a drive like that, you feel every bit of its engineering working beneath you. But keeping that reliability alive means staying on top of the mainten