The ARB has forced through a new set of confidentiality rules to silence Ian Salisbury and his campaign to pare back the regulator.
The board brought in the rules at a meeting last week in response to Salisbury's barrage of public criticism. But the rebel member has vowed to ignore the regulations, dismissing them as 'nothing more than a gagging order'.
Salisbury said he believed his stance would lead to his removal from the board, a move that he predicted would 'signal the beginning of the end for the ARB'.
The row was triggered by a motion - proposed by former trade union boss Bill Morris at a board meeting last week - which called on board members to accept the concept of 'collective responsibility'.
The new regulations mean board members are now unable 'to speak out in public against decisions taken during confidential sessions of the board'.
But Salisbury said he was committed to ignoring the rules. 'This is a manipulative, coercive and undemocratic, ' he told the AJ. 'This is against the concept of democracy.
'There are clearly members that believe their duty is to the board. I am different - my duty is to the people that elected me and that will never change.
'If the other board members try to vote me off there will be blood on the carpet, ' he added. 'It will mean the beginning of the end for the ARB. It would be dead in the water.'
However, fellow board member Yasmin Shariff warned that Salisbury was 'overreacting'. 'If you are a member of any board it is your duty to accept the decisions of that board, ' she said.
'If you don't like something then you discuss it and try to persuade other members to your perspective. If the board agrees something you feel unable to support, then you resign.
'Ian has gone about this in completely the wrong way, ' she added. 'He is attempting to make the ARB look like a secretive organisation, which it is not.'