What component connects the piston to the master cylinder and transfers force?

The output rod is the component that effectively connects the piston to the master cylinder in a braking system. Its primary role is to transfer the force generated when the brake pedal is pressed to the master cylinder, which in turn activates the brake mechanism. When the driver applies force to the brake pedal, this force is transmitted through the output rod, compressing the fluid in the master cylinder and sending hydraulic pressure to the brake calipers or drums.

The other components mentioned have different functions: the power piston is involved in creating hydraulic pressure but does not serve the same role of transferring force from the pedal to the master cylinder. The vacuum assist booster enhances braking power but does not connect the piston and the master cylinder directly. The return spring, meanwhile, helps to return the brake components to their original position after the brake pedal is released but does not play a role in force transfer between the piston and the master cylinder. Thus, the output rod is essential for the effective operation of the braking system, ensuring that the driver's input results in the desired braking response.