Changes of average vacuum for milking phase in a teat cup of recorder milking machine was analysed. Analysis was conducted with 6 milking units working, installed one after another in front of measuring unit which was connected to milk tap most distant from receiver of milk line from branch (return line for washing is situated above the milk transfer line). In the article major influence of stream of liquid simulation of milking rate Q_m and load coefficient of milkline K_o, being a total influence the stream of liquid and transient air admission on changes of average vacuum for the milking phase is shown. By full load of milking installation, with 6 milking units working, the decrease of vacuum at the teat end (by 21 kPa) is influenced by the decrease (by 16 kPa) of vacuum caused by stream of outflow of liquid (milk) Q_m in measuring unit and the decrease of vacuum (by 5 kPa) caused by load of milkline K_o.

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