A method for adjusting a pressure in a vacuum shaft system

A method for adjusting a pressure in a volume (52) in a vacuum shaft system includes the method comprising the steps of: a) determining pressure values ​​(4) which are a measure of the pressure in the volume (52) at different time points and storing the determined pressure values, b) determining a maximum value (12) and a minimum value (14) from the stored pressure values, c) determining a difference value (16) from the maximum value (12) and the minimum value (14), d) comparing the difference value (16) with a predetermined first threshold value and e) activating a pump (56) for sucking a fluid from the volume (52) if the difference value (16) is greater than the predetermined first threshold value.