| 摘要 |
An input rod and an input piston are advanced in response to an operation of a brake pedal, and an electric motor is driven according to the movement of the input piston to push a primary piston forward in a master cylinder through a ball-screw mechanism, thereby generating desired hydraulic pressures in a primary chamber and a secondary chamber and supplying the hydraulic pressure to the brake caliper of each wheel. At this time, a part of the hydraulic pressure in the primary chamber is received by the input piston to feed back to the brake pedal a part of the reaction force of hydraulic pressure during braking. A retainer of a spring assembly interposed between the primary and secondary pistons has a hollow structure to insert therein the forward end portion of the input piston, thereby allowing a reduction in the axial length of the primary piston.
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