Abstract: A simple hand held carbon dioxide applicator having a pressurized carbon dioxide cartridge is used to release spring applied hydraulically released brakes. The hydraulic line extending between the hydraulic pump and the brake control valve is provided with a first coupler of a quick coupling with the corresponding second coupler being hydraulically positioned between the hydraulic line and the pump. An auxiliary line is provided having an auxiliary coupler identical to the second coupler so that the auxiliary line can be attached to the first coupler. The auxiliary line is also provided with a gas check valve in the form of a schraeder valve to which the hand held carbon dioxide applicator is pneumatically coupled.