Method for Operating a Brake System of a Motor Vehicle

A method is for operating a brake system of a motor vehicle. The brake system includes at least one service brake and a transmission device having an output rod, by way of which a braking force is transmitted to the at least one service brake. The brake system further includes at least one parking brake having a trigger device for activating the at least one parking brake. The method provides increased safety and simplified implementation by (i) using an adjustment travel of the output rod to ascertain a deceleration acting on the motor vehicle due to the at least one service brake, and (ii) activating the at least one parking brake, when the trigger device is actuated, when the motor vehicle is ascertained as being stationary, taking into consideration the deceleration.