Dumb master cylinder question.

Did some more research. If master cylinder is on the firewall and not below the floorboard, a residual pressure valve is not needed. I am going to use a GM type combination valve for both cars. I was able to buy one set up for 4 wheel disc, and one set up for disc/drum. One car is a 4 wheel disc setup with cordoba big brakes in the front, xploder rears, dippy master cylinder. Other car is cordoba big brakes in front, cordoba 10x2.5 drums in the rear, dippy master cylinder.

The GM combination valve meters and proportions the fluid all in one simple compact unit. The mopar one with exta piece and crossover tube for disc brakes is double the money, and looks like an effing science project to me.