Abstract: A planetary gear assembly, in particular for an electromechanical service or parking brake for a motor vehicle. The planetary gear assembly can include a central sun gear, a plurality of planetary gears rotatably mounted on a planetary carrier, and a ring gear enclosing the planetary gears. The planetary gears can be mounted by the planetary carrier, such that the planetary gears roll off both the sun gear and the ring gear, whereby the sun gear, the planetary carrier or the ring gear is non-rotatably held by a holding unit with a holding torque. A force-sensing device can be arranged between the holding unit and the non-rotatably held element, or between the holding unit and an intermediate component non-rotatably connected to the held component. The force-sensing device can measure the force acting between the held component and the holding unit as a result of the holding torque.