Brake was actively involved in human rights issues as a student. He was elected as a councillor in the London Borough of Hackney in 1988, leaving the council in 1990. In 1994 Brake was elected as a councillor in the London Borough of Sutton and sat on the council until 1998. Brake stood for election to Parliament at the 1992 general election in Carshalton and Wallington, but was defeated by ConservativeNigel Forman.
Parliamentary career
In what proved to be a close contest, Brake was elected at the 1997 general election as the Liberal Democrat MP for Carshalton and Wallington, beating Nigel Forman with a majority of 2,267, and remained MP there until he lost the seat at the 2019 general election. He made his maiden speech on 10 June 1997. Brake defeated Conservative Ken Andrew in 2001, 2005 and again in 2010 with an increased majority. In 2015 his majority was lessened to 1,510, narrowly ahead of Conservative Matthew Maxwell-Scott. After the 1997 election, party leaderPaddy Ashdown placed Brake on the frontbench as a spokesman on the Environment, Transport and the Regions. Following the 2001 General Election, then party leader Charles Kennedy appointed him a spokesman on Transport, Local Government and the Regions. In 2002 he became a Transport spokesman. He joined the Liberal Democrat frontbench team in 2003 as the lead International Development spokesman. After the 2005 General Election he became the Transport spokesman. He was relieved of this position under the new leadership of Sir Menzies Campbell in March 2006, and later that year became spokesperson for local government. In 2007 Brake became spokesperson for London and the Olympics. In 2008 he was also appointed as a Home Affairs spokesperson. In June 2010 Brake was named Co-Chair of the new Liberal Democrat Backbench Committee on Home Affairs, Justice and Equalities. Brake will Co-Chair the committee alongside Baroness Hamwee and Lord Thomas of Gresford OBE QC. In September 2010 Brake attempted to introduce a bill "to amend the Freedom of Information Act 2000 to remove provisions permitting Ministers to overrule decisions of the Information Commissioner and Information Tribunal; to limit the time allowed for public authorities to respond to requests involving consideration of the public interest; to amend the definition of public authorities; and for connected purposes." On 11 June 2011, it was announced Brake would be appointed a Privy Counsellor in the Queen's 2011 Birthday Honours list. On 4 September 2012 he was appointed Deputy Leader of the House of Commons, replacing Liberal Democrat David Heath MP who was promoted to Minister of State in DEFRA. Before he was appointed Deputy Leader of the House of Commons, Brake was the Secretary of the All-Party Group for World Government, Treasurer of the All-Party Human Rights group, a member of the Franco British Parliamentary Relations group. Between 2014 and 2015, Brake was an Assistant Whip for HM's Treasury. In January 2015, Brake was appointed to the Liberal Democrat General Election Cabinet as the party's Leader of the House of Commons and London spokesperson. On 29 July 2015, Brake was named as foreign affairs spokesperson and party chief whip. In June 2017, Brake was appointed as a Liberal Democrat spokesperson for international trade and European affairs. In an interview with British-American centrist Owen Prell, who was visiting on behalf of Unite America, and conducted in Brake's Westminster office on June 21, 2017, Brake mostly ascribed the inability of the Liberal Democrats to perform better in British elections to the first-past-the-post system of electing MPs. He is an honorary associate of the National Secular Society. Brake lost his seat in the 2019 general election to Elliot Colburn of the Conservative Party.