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. 136), judicial co-operation in criminal matters (Art. 270) and the approximation of definitions of criminal offences (Art. 271).  The procedure basically allows one Member State on the Council to refer the proposal to the European Council if the M.S. thinks that the proposal affects fundamental elements of its legal system. (http://europa.eu/scadplus/constitution/majority_en.htm#EMERGENCY)  It is a very specific procedure, and I'm not sure if it is worth detailing in the Article?