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In this video we will talk about the operation of the non-automatic direct-acting brake (254 valve), as well as the operation of the automatic brake (394 valve) on 2TE10M diesel locomotives. Why the first position of the 254 valve handle does not work on the 2TE10M. Auxiliary brake valve 254: • Auxiliary brake valve condition No. 254 pressure relay 304: • Pressure relay condition No. 304