This device for holding at least one longitudinal element, of the wiring harness or tube type, on a support, comprises a deformable clamp that allows said longitudinal element to be inserted into the clamp and holds the longitudinal element, and a protective layer that at least partially covers the clamp. By properly controlling the difference between refractive indices and the difference between Abbe numbers of the resin and glass, interface reflection that occurs when a ray with a large incidence angle is incident is restricted, and generation of a flare or a ghost image is restricted. An elongated sensor housing is mounted upon the elbow. A mechanism is created for detecting the event based on execution of the statements. The outlet port of the parking brake valve is connected to the return port of the pressure control servo valve. Additional steps include carrying out the substrate having the resin layer precursor layer from the fastening table, and drying and curing the resin layer precursor layer on the substrate to form a coating resin layer on the substrate.