Aar cuda & R/T metering valve drum/disc

Well that hold off valve is so the fronts get liquid before the backs idk if the last picture (the diagram) is just backwards and upside down or what but still boggles me that they want the..ohhh well they could of explained it differently like residual marked (f) would of sufficed but I’ve been having rear wheels lock up before front discs engage so hopefuly this will help the original (tree) proportioning valve is just like this but stopped rather shittly so hopefuly this hold off valve will let the front discs enguage better