The Stovebolt Site Forums The Shop Area Driveline Let's talk brakes, lines, and master cylinders..

Not sure if this is applicable, but on AD trucks, there is a distribution block on the rear of the MC, that splits the lines into one 3/16” line that supplies the front drivers side brake and a 1/4” line that supplies a three way block on the passengers side frame, 1/4” in and two 3/16” lines out. One 3/16” line goes to the front passenger side brake and the other supplies the two rear brakes. I suspect the 1/4” line provides more volume, considering it is suppling fluid to three brakes.