| 摘要 |
In a BBW type brake system, first ports of fluid pressure generators are closed to generate brake fluid pressure in respective wheel cylinders before a master cylinder generates brake fluid pressure, by initiating the operation of the fluid pressure generators based on the output of a pedal stroke sensor. Therefore, the brake fluid pressure generated by the master cylinder is prevented from being transmitted to wheel cylinders, even when a shutoff valve, which closes during normal operation of a conventional BBW type brake system, is not provided, thereby providing reliable operation of the BBW type brake system. Thus, since the master cylinder and the fluid pressure generators are kept in communication at a non-braking time, a reservoir of the master cylinder can be also used as the reservoir of the fluid pressure generators without providing the system with an atmosphere valve, which is conventionally required.
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