The middle fabric layers of most brake hoses have three plies with a jacket on the outside layer to protect the plies.

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Most brake hoses are designed with a multi-layered structure, but they typically consist of an inner tube, a reinforcement layer (which can be one or more plies), and an outer cover. The specific number of plies and the presence of a jacket can vary depending on the design and manufacturer, but stating that most have exactly three plies with a jacket on the outside as a standard structure is inaccurate.

The Middle Fabric Layers of Most Brake Hoses Have Three