Brazeau was arrested Thursday on charges of assault, uttering death threats, cocaine possession and breach of bail conditions.
Police say an incident took place early Thursday morning at a home in Gatineau that was described as an altercation between a man and a woman.
Police say the woman alleges she was assaulted and another man who was inside the house also says he was assaulted and threatened.
Brazeau was already due to appear in court today on charges of assault and sexual assault in relation to an incident from February, 2013.
It's not clear if both sets of charges will be addressed at today's court appearance.
Brazeau also faces charges of fraud and breach of trust in connection with his Senate expense claims.
Last year the Senate ordered Brazeau to pay back almost $50,000 over disputed expense claims. He refused, and the Senate garnisheed his salary until last November, when he was suspended without pay.
Note to readers: This is a corrected story. A previous version had incorrect information on how Brazeau pleaded Thursday. The correct information is that he pleaded not guilty.