A pressure member is provided suitable for use in an image forming system. The second substrate includes a stepped portion including an upper tier located in the reflection region, a lower tier located in the transmission region and a side surface connecting the upper tier and the lower tier to each other, the side surface of the stepped portion being located in the reflection region and covered by the second electrode. The method further comprises depositing an insulator layer on the read sensor. Tires that have been mounted on wheel rims are placed on the mounting brackets, a bead is set by a blast of air, and an air inflation hose is connected to the tire.