Vehicle braking systems and method of operating one

A vehicle braking system (10) includes a wheel cylinder (20), a master cylinder (14) including a master cylinder piston (14A,14B) operable to translate between an unactuated position and an actuated position in a first mode of operation, a brake pedal (18) operable to transition between an extended position corresponding to the unactuated position of the master cylinder (14) and a retracted position corresponding to the actuated position of the master cylinder(14), and a booster (30) located between the master cylinder (14) and the brake pedal (18). The master cylinder (14) is operable to selectively transfer a braking force from the brake pedal (18) to the wheel cylinder (20) in the first mode of operation (e.g. user braking or BBW). The booster (30) is operable to hold the brake pedal (18) in the retracted position (stowed position) in a second mode of operation (e.g. an autonomous driving mode) without user input and without associated braking. 一种车辆制动系统（10）包括：轮缸（20）；主缸（14），其包括主缸活塞（14A，14B），主缸活塞（14A，14B）可操作