| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure smooth operation of a master piston by pressing of a backup piston in a brake device for a vehicle. <P>SOLUTION: In the brake device for the vehicle, a servo liquid pressure from a hydraulic booster for adjusting an output liquid pressure of a liquid pressure generation source to the servo liquid pressure corresponding to brake operation input is applied to a servo liquid pressure action chamber making facing to a back surface of the master piston and the master piston can be directly pressed by the backup piston at reduction of the output liquid pressure of the liquid pressure generation source. A front end of the backup piston 64 is abutted on the whole periphery of a peripheral edge of the back surface of the master piston 23 in the non-operation state of a brake operation member. <P>COPYRIGHT: (C)2007,JPO&INPIT |
