Old post but just to clarify the emergency brake procedure is better described as Qualified Majority with Emergency Brake it is a procedure used only for legislative proposals relating to the free movement of workers Art  judicial cooperation in criminal matters Art  and the approximation of definitions of criminal offences Art   The procedure basically allows one Member State on the Council to refer the proposal to the European Council if the MS thinks that the proposal affects fundamental elements of its legal system httpeuropaeuscadplusconstitutionmajorityenhtmEMERGENCY  It is a very specific procedure and Im not sure if it is worth detailing in the Article