Brake sub-assembly for a brake system of a vehicle comprising a) an electrical drive and b) a brake force transmission unit, c) wherein the brake sub-assembly forms a mounting unit comprising ca) an assembly interface for mounting the brake sub-assembly to another brake sub-assembly which comprises a brake device and a further force transmitting unit and cb) a force transfer interface for transferring an output force from the brake sub-assembly to the brake sub-assembly characterized in that d) the brake force transmission unit comprises a toggle lever drive with da) a first toggle lever having a fixed rotational axis and being driven by the electrical drive, a driving shaft being coupled under fixation against rotation to the first toggle lever, the driving shaft being directly driven by the electrical drive or a planetary gearset or any other additional transmission system being located in the force flow between the electrical drive and the driving shaft and db) a second toggle lever which is pivotally linked to the first toggle lever by a toggle joint and which forms a pushrod, one end region of the pushrod forming the force transfer interface which can be coupled to the force transfer interface of a pivoted brake lever of the brake sub-assembly. a) an electrical drive and b) a brake force transmission unit, c) wherein the brake sub-assembly forms a mounting unit comprising ca) an assembly interface for mounting the brake sub-assembly to another brake sub-assembly which comprises a brake device and a further force transmitting unit and cb) a force transfer interface for transferring an output force from the brake sub-assembly to the brake sub-assembly characterized in that ca) an assembly interface for mounting the brake sub-assembly to another brake sub-assembly which comprises a brake device and a further force transmitting unit and cb) a force transfer interface for transferring an output force from the brake sub-assembly to the brake sub-assembly d) the brake force transmission unit comprises a toggle lever drive with da) a first toggle lever having a fixed rotational axis and being driven by the electrical drive, a driving shaft being coupled under fixation against rotation to the first toggle lever, the driving shaft being directly driven by the electrical drive or a planetary gearset or any other additional transmission system being located in the force flow between the electrical drive and the driving shaft and db) a second toggle lever which is pivotally linked to the first toggle lever by a toggle joint and which forms a pushrod, one end region of the pushrod forming the force transfer interface which can be coupled to the force transfer interface of a pivoted brake lever of the brake sub-assembly. da) a first toggle lever having a fixed rotational axis and being driven by the electrical drive, a driving shaft being coupled under fixation against rotation to the first toggle lever, the driving shaft being directly driven by the electrical drive or a planetary gearset or any other additional transmission system being located in the force flow between the electrical drive and the driving shaft and db) a second toggle lever which is pivotally linked to the first toggle lever by a toggle joint and which forms a pushrod, one end region of the pushrod forming the force transfer interface which can be coupled to the force transfer interface of a pivoted brake lever of the brake sub-assembly.