Volunteer firefighters in Victoria have been urged not to leave the Country Fire Authority (CFA) and start up their own brigades over a controversial workplace agreement, as a former Supreme Court judge says the deal is "highly unsatisfactory".

The CFA board was sacked on Friday after it failed to accept the State Government's latest offer over pay and conditions, despite the Supreme Court granting an injunction to stop the board from voting on it.

One brigade at Molyullah near Benalla in Victoria's north-east has threatened to break-away from the CFA over the dispute.

The brigade's captain, Campbell Griffin, said the firefighter's union was intent on taking over control of the CFA.

He said placing paid firefighters into a country station would push volunteers out.

"We would no longer be able to protect the state effectively" he said.

"If morale is so low and we are being treated so poorly that people don't want to be members of a volunteer brigade or up-skill themselves then we can't function"

Volunteer Fire Brigades Victoria chief executive Andrew Ford said a number of CFA brigades were considering leaving the organisation and starting up their own volunteer firefighting force.

"There is talk amongst some brigades that, if CFA is destroyed by this sort of union deal … [and] the approach being taken by Daniel Andrews, that they would take their keys and take their truck and continue to protect their community in the way they have done for years," he said.

Mr Ford said, despite the bitter enterprise bargaining dispute, the CFA's brigades should remain united.

"I would be discouraging [leaving the CFA]," he said.

"The CFA works and is needed for Victoria as a network of brigades. Just taking one brigade out of the system would not be a good thing, and that's why we've got to stay and seek a solution to save the CFA."

Volunteer firefighting under threat, former judge says

Meanwhile, prominent lawyer and former Supreme Court judge Jack Rush QC has thrown his support behind the CFA.

Mr Rush led the 2009 Victorian Bushfires Royal Commission.

Jack Rush QC says he believes the deal could alter the role of CFA volunteers. ( Rob Baird: AAP )

He said the enterprise bargaining agreement (EBA) being pushed by the State Government would damage the CFA.

"I have looked into the EBA and it is highly unsatisfactory for volunteer firefighters" he said.

Mr Rush warned that people would stop volunteering if a system was forced on them from outside of their own community.

"The whole ethic of volunteers is being put under threat by what is going on," he said.

"Without volunteer firefighters the state is at risk"

Mr Rush said he disagreed with the Fair Work Commission recommendations that the role of volunteers would not be altered.

Volunteers will 'seek support' during election campaign

Mr Ford said volunteer firefighters were not party political, but would be out in force during the federal election campaign to highlight their concerns.

"There will be no organised political campaign from Volunteer Fire Brigades Victoria or volunteers," he said.

"But volunteers will be very active in their communities, talking to people, explaining their concerns and seeking to get peoples' support."

Before the board was sacked, the CFA's leadership team said it had received advice from the Government's senior crown counsel that parts of the agreement remained unlawful.

In a statement on Monday, the board again said it would not sign the agreement.

"The EBA creates a fundamental shift from CFA being a volunteer-based organisation working in an integrated way with paid staff, to a separation between staff and volunteer activities," the CFA said.

"Our legislation, the CFA Act and the Volunteer Charter do not support that shift.

"This board will not sign an agreement which is unlawful, and which impedes us from fulfilling our legislative responsibilities."

Jane Garrett, who had long supported the CFA in the dispute, resigned from Cabinet on Friday, with Deputy Premier James Merlino taking over the Emergency Services portfolio.