Method for improving an engine brake procedure, in particular for a combustion engine installed in a commercial or industrial vehicle, the method including the preliminary steps of providing the internal combustion engine (E) of a e-turbocharger (E-TCU) and a second motor-generator (EMU) operatively coupled with a crankshaft (CK) of the internal combustion engine; the method including the following steps when an engine brake operation is active: controlling said first electric motor-generator (EM) to increase the boost produced by said compressor, and controlling said second motor-generator (EMU) to apply its maximum possible braking torque to the combustion engine.