Mercury - MerCruiser Bravo One 300 Hour Maintenance Kit Precision Sterndrive Service Kit Marine-Ready Components 8M0147074. Overview. Anyone who runs a Bravo One sterndrive knows the feeling - that unmistakable push when you roll into the throttle, the steady grip when the hull settles in and the confidence that comes from a drive built to handle real power. Over the years, these drives earn a kind of respect. They're strong, loyal and capable, but only if you keep them cared for. The Mercury Ma