Describing AAP national convenor Arvind Kejriwal as "messiah on the country's political landscape", he said his front 'Lokhit Abhiyan' will give unconditional support to the party in the state.
"This is an alliance on Punjab's issues with AAP. There is no condition from my side whatsoever like position or anything. The only issue is that Punjab's vote should not be divided," Brar, who was expelled from Congress in April, he said.
Workers of Lokhit Abhiyan will support the AAP in order to defeat Congress and SAD-BJP combine in coming Punjab polls, he said.
Asked whether he will contest Punjab polls, Brar said he would leave the decision to the leadership of AAP. "Whatever decision AAP takes regarding elections, that will be obeyed," he said.
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Speaking on this occasion, AAP's in-charge of Punjab affairs Sanjay Singh said traditionally, political parties enter into alliance and take decision on seat sharing, position etc.
"But in this case, this alliance is based on issues and it is not a political alliance. It is an issue-based alliance," he said, adding that their main motive is to "save Punjab".
Praising Brar, Singh said he was one of the tallest leaders in Punjab and had been a member of Congress Working Committee and had even once defeated Sukhbir Badal in Lok Sabha elections.
"He has always worked for poor and raised voice in support of youth," Singh said.
On this occasion, AAP's co-incharge of Punjab Jarnail Singh, Sangrur MP Bhagwant Mann, party's Punjab Convenor Gurpreet Singh Ghuggi, Head of legal cell Himmat Singh Shergill were also present.
After the party's defeat in 2014 Lok Sabha polls, he had suggested that Congress President Sonia Gandhi and party vice-president Rahul Gandhi go on a sabbatical to introspect on the reasons for the party's worst performance in the elections.
Brar, after his expulsion from Congress, attacked the ruling Badals and Punjab Congress chief Amarinder Singh terming them "traitors of Punjab".
The former Lok Sabha MP from Faridkot in Punjab had defeated Sukhbir Badal in 1999. Badal had won the same constituency defeating Brar in 2004.