Abstract: The present invention relates to a device designed to quickly and efficiently unfreeze a frozen tractor trailer brake system. The device features a junction and T-valve assembly having a removable top plug, a quick connect fitting attached to both a first end of the junction and a tractor emergency brake line, and an outlet pipe attached to both a second end of the junction and the trailer glad hand. A de-icing solution may be introduced into an opening in the T-valve and forced through the trailer brake system by utilizing the air pressure from the tractor's emergency air brake, wherein the de-icing solution quickly and efficiently thaws the frozen brake system.