What should be created first when making a repeating detail type for a brick?

Creating a repeating detail type for a brick begins with the establishment of a detail component type. This step is crucial as the detail component serves as the building block for the repeating detail itself within the Revit environment. The detail component type provides the necessary definition of the brick's visual representation in 2D views, allowing it to be used effectively in details and sections.

Starting with detail components ensures that the specific attributes related to detailing are correctly defined, such as line weight and visibility settings. By having this foundation, these components can then be reused in multiple locations throughout the project, maintaining consistency and accuracy in detailing.

Other options, while important in their own rights, would come into play after the detail component type has been established. The 3D brick family and the generic model family are more suited for 3D representations and modeling elements, rather than 2D details. The generic annotation type, though useful for notations and labels, does not directly relate to the creation of the brick detail itself. Thus, beginning with the detail component type lays the groundwork for effectively developing a repeating detail type.