1938-48 Pass Car and Pick-up.
7/16”-24 inverted flare inlet, Front & Rear.
WARNING - These parts are designed to operate under hydraulic fluid pressure. To insure that there is no damage to the seals avoid the temptation to push inward on the cylinder dust covers and pucks with your fingers prior to installation (when there is no fluid in the cylinders). With lack of fluid in the cylinder, this action can dislodge the internal rubber cup piston seals from the installed position. Failure of the internal seal to seat correctly can produce a wheel cylinder fluid leak which allows air to enter the lines and disable the brake system.