Portable hydraulic park brake release apparatus and method for work vehicle

An assembly for a work vehicle includes an emergency portable hydraulic park brake release assembly for a spring applied, hydraulically released park brake. The portable hydraulic park brake release assembly includes a CO2 cartridge which is activated when the park brake is in the applied position. This causes gas from the CO2 cartridge to be introduced into a hydraulic conduit of the park brake to move to move the park brake to the released position.