This follows a board decision earlier this month in which the officers were found to have failed to fulfil their duties, illegally detained a citizen and wrote up a false report about the incident, which occurred late July 26, 2012.
According to evidence presented before the commission, Gauthier struck the young man several times after he shouted insults at police at the corner of Ste-Catherine Street and St-Laurent boulevard.
The two officers then drove the Montreal resident to Île-Sainte-Hélène and left him there.
In their report, they indicated they left him at the corner of Berri and Viger streets.
Several 911 calls from motorists reporting the young man walking on Jacques Cartier Bridge corroborated the account.
Arguments were made Tuesday with regards to the length of suspensions, ranging from a week to a month. Ethics board head Pierre Gagné will make his decision in the coming weeks.