The Fijian submitted a guilty plea after being cited for a lifting tackle on his Argentine opponent in the 39th minute of the Crusaders' 40-14 victory in Canberra on Sunday.
Nadolo was banned until May 21 and will miss matches against the Queensland Reds, Otago Highlanders and New South Wales Waratahs, as well as a club fixture next weekend when the Crusaders have a bye.
The powerful 28-year-old was outstanding against the Brumbies, scoring one try and setting up another as the seven-times champions won a seventh successive match to keep pace with the Waikato Chiefs at the top of the New Zealand conference.
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(Reporting by Nick Mulvenney, editing by Peter Rutherford)
