Primary piston component for a master cylinder of a hydraulic brake system comprising: a primary piston housing, which is configured to be at least partially movable into a pressure chamber of the master cylinder, wherein a cavity is formed at a back side of the primary piston housing, and wherein at least one continuous aperture is formed at an inner side of the cavity directed to a front of the primary piston housing; and an additional piston component, which is configured to be at least partially movable into the cavity of the primary piston housing; characterized in an inner piston body, which extends through the cavity along a central line of the primary piston component, wherein the inner piston body is designed to be arranged close to at least one first braking force transfer element (56, 62, 66) in a way that a braking force (Fd) applied on a brake actuating element is transferable at least partially via the at least one first braking force transfer element (56, 62, 66) on the inner piston body, and the inner piston body contacts the primary piston housing in a way that the braking force (Fd) is transferable at least partially on the primary piston housing, and wherein the additional piston component is at least partially movable into the cavity between the inner piston body and the primary piston housing, and wherein the additional piston component is designed to be arranged close to the at least one first braking force transfer element (56, 62, 66), at least one second braking force transfer element anda brake booster in a way that a brake booster force (Fb) provided by the brake booster is transferable at least partially on the additional piston component, which contacts the inner piston body in a way that the brake booster force (Fb) is transferable at least partially via the inner piston body on the primary piston housing. a primary piston housing, which is configured to be at least partially movable into a pressure chamber of the master cylinder, wherein a cavity is formed at a back side of the primary piston housing, and wherein at least one continuous aperture is formed at an inner side of the cavity directed to a front of the primary piston housing; and an additional piston component, which is configured to be at least partially movable into the cavity of the primary piston housing; an inner piston body, which extends through the cavity along a central line of the primary piston component, wherein the inner piston body is designed to be arranged close to at least one first braking force transfer element (56, 62, 66) in a way that a braking force (Fd) applied on a brake actuating element is transferable at least partially via the at least one first braking force transfer element (56, 62, 66) on the inner piston body, and the inner piston body contacts the primary piston housing in a way that the braking force (Fd) is transferable at least partially on the primary piston housing, and wherein the additional piston component is at least partially movable into the cavity between the inner piston body and the primary piston housing, and wherein the additional piston component is designed to be arranged close to the at least one first braking force transfer element (56, 62, 66), at least one second braking force transfer element anda brake booster in a way that a brake booster force (Fb) provided by the brake booster is transferable at least partially on the additional piston component, which contacts the inner piston body in a way that the brake booster force (Fb) is transferable at least partially via the inner piston body on the primary piston housing.