Hydraulic Brake Park Lock 1/8npt Manual Brake Lock Pressure Hold For Disc Drum Operation:step on the brakes. down the knob on the Brake Lock.Release the foot brake and it's locked.To release the lock, step on the foot brake and it opens automatically.Install:Use two holes to mount the brake lock where is properly.In port (1/8 inch ): connect to master brake cylinder, it also come with 3/16 inch brake fitting, you can chose to use the fitting or not.Out port (1/8 inch ): connect to rear brakes. , it also come with 3/16 inch brake fitting., you can chose to use the fitting or not.Note: it should NOT be used under unintended, emergency or long time hold brake.colour:blackMaterial:Aluminum alloyPackage Contents:1 x Hydraulic Brake Park LockOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.