What was left? Included with the Inline Tube kit are two very short stainless lines. These lines feed brake fluid from the master cylinder to the proportioning valve. The bigger line (1/4-inch) will feed the rear brakes while the smaller, 3/8-inch line provides fluid for the front. At the top and end (facing diagonally) of our Master Power proportioning valve (pointing towards front bumper) there is another threaded opening. Here, we threaded in the smaller line for the driver side front brakes handtight.