Proportioning valves are normally not required on drum/drum applications. Most master cylinders for drum/drum
applications should have an internal residual valve. Check with your supplier. However, they may not know as many
just push parts out and don't know the technical aspects of their products.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine