| 摘要 |
Engaging grooves 8e extending in the cylinder axial direction and circumferential grooves 8f formed in a cylinder axial direction middle portion of the engaging grooves 8 are formed on a bottom side of a cylinder hole 8. Engaging rib 12b engaging with the engaging groove 8e and engaging rib 16d which engages with the engaging groove 8e and fits to the circumferential groove 8f are formed on a fixed side cam plate 12 and a housing, respectively. A bleeder hole 8g which penetrates communicates with the engaging grooves 8e and circumferential grooves 8f of the cylinder hole 8 is drilled in a caliper body 2. Communication holes 16h which allow communication between the inside and outside of the housing 16 is formed at a bottom side of the cylinder hole 8 rather than the engaging rib 16f of the housing. |
