An integrated engine brake assembly, comprising: a valve that forces oil circulating through an engine to flow to an exhaust rocker arm when an engine brake lever is operated; a bridge that forms an interval with a pair of first and second exhaust valves installed on a combustion chamber; an internal oil flow path which supplies the oil flowing toward the exhaust rocker arm to the bridge through an internal space of the exhaust rocker arm, and along which the oil is supplied to the bridge and brings the bridge into contact with the pair of first and second exhaust valves under pressure; and a protrusion that lifts up the exhaust rocker arm at a compression top dead center so that the pair of first and second exhaust valves are pressed and opened forcibly by the bridge, and the bridge is pressed by seesaw movement of the exhaust rocker arm, wherein the internal oil flow path includes: an oil inlet that is formed in a shaft hole of the exhaust rocker arm and into which the oil that flows toward the exhaust rocker arm flows; an oil flow path that is formed inside the exhaust rocker arm so that an oil flow of the oil inlet leads to an end portion of the exhaust rocker arm; and an oil outlet that is connected to the oil flow path so that the oil flowing into the oil flow path is discharged to the bridge; and wherein the bridge includes: a chamber that is filled with the oil discharged from the oil outlet to form oil pressure; a pair of first and second master pistons that are housed in the chamber to be lowered due to the oil pressure of the chamber and come into contact with the pair of first and second exhaust valves; a reset pin, a portion of which is exposed to an outside of the chamber characterized in that the reset pin is in contact with a reset bar so that the oil within the chamber is discharged to the outside, when the reset pin is activated, wherein the reset bar is configured such that it applies a force to the lower portion of the reset pin and thus the reset pin is pushed into the chamber of the bridge to discharge the oil filled in the chamber. a valve that forces oil circulating through an engine to flow to an exhaust rocker arm when an engine brake lever is operated; a bridge that forms an interval with a pair of first and second exhaust valves installed on a combustion chamber; an internal oil flow path which supplies the oil flowing toward the exhaust rocker arm to the bridge through an internal space of the exhaust rocker arm, and along which the oil is supplied to the bridge and brings the bridge into contact with the pair of first and second exhaust valves under pressure; and a protrusion that lifts up the exhaust rocker arm at a compression top dead center so that the pair of first and second exhaust valves are pressed and opened forcibly by the bridge, and the bridge is pressed by seesaw movement of the exhaust rocker arm, wherein the internal oil flow path includes: an oil inlet that is formed in a shaft hole of the exhaust rocker arm and into which the oil that flows toward the exhaust rocker arm flows; an oil flow path that is formed inside the exhaust rocker arm so that an oil flow of the oil inlet leads to an end portion of the exhaust rocker arm; and an oil outlet that is connected to the oil flow path so that the oil flowing into the oil flow path is discharged to the bridge; and an oil inlet that is formed in a shaft hole of the exhaust rocker arm and into which the oil that flows toward the exhaust rocker arm flows; an oil flow path that is formed inside the exhaust rocker arm so that an oil flow of the oil inlet leads to an end portion of the exhaust rocker arm; and an oil outlet that is connected to the oil flow path so that the oil flowing into the oil flow path is discharged to the bridge; and wherein the bridge includes: a chamber that is filled with the oil discharged from the oil outlet to form oil pressure; a pair of first and second master pistons that are housed in the chamber to be lowered due to the oil pressure of the chamber and come into contact with the pair of first and second exhaust valves; a reset pin, a portion of which is exposed to an outside of the chamber characterized in that the reset pin is in contact with a reset bar so that the oil within the chamber is discharged to the outside, when the reset pin is activated, wherein the reset bar is configured such that it applies a force to the lower portion of the reset pin and thus the reset pin is pushed into the chamber of the bridge to discharge the oil filled in the chamber. a chamber that is filled with the oil discharged from the oil outlet to form oil pressure; a pair of first and second master pistons that are housed in the chamber to be lowered due to the oil pressure of the chamber and come into contact with the pair of first and second exhaust valves; a reset pin, a portion of which is exposed to an outside of the chamber characterized in that the reset pin is in contact with a reset bar so that the oil within the chamber is discharged to the outside, when the reset pin is activated, wherein the reset bar is configured such that it applies a force to the lower portion of the reset pin and thus the reset pin is pushed into the chamber of the bridge to discharge the oil filled in the chamber.