This hydraulic Park Lock uses line pressure to hold your brakes locked.
Just push brake pedal down and push the Park Lock lever.
Not to be used as an emergency brake
Empi 3155 Hydraulic Brake Park Lock. This Is A Manual Push Button Hydraulic Lock Using The Brake Fluid Line Pressure To Hold The Brakes Locked In Place. Once Installed Simply Press The Brake Pedal Down, Then Push And Hold Down The Park Lock Button While Releasing The Brake Pedal. Inlet And Outlet On This Park Lock Is Tapped For 1/8" NPT And Is Provided With 2 Brass Fittings 1/8" NPT X 3/16" American Female. Note: This Should Not Be Used As A Emergency Brake, Most OEM Emergency Brakes Are Cable Controlled.