According to the BBC, Cameron is expected to tell European Council President Donald Tusk during their upcoming meeting on the issue that the "brake" should be implemented immediately after the UK referendum on its EU membership.
Cameron is also expected to demand the brake would be in force long enough to cope with EU migration to the United Kingdom.
Cameron has pledged to hold a referendum on the United Kingdom's membership of the bloc, referred to as an in/out vote, no later than late 2017. His four reform demands encompass boosting competitiveness by reducing bureaucratic red tape, exempting the United Kingdom from plans for an "ever closer union," stripping the euro of its sole official EU currency status and restricting in-work benefits to intra-EU migrants.