Residual Pressure Valve placement

brian6pac said
No, it shouldn't need one the wheel cyl's are make to with a metal cup behind the rubber and that keeps pressure on the cup and keeps it from leaking,
Spring and expander's in the picture
the check valve holds pressure on the cups and stops them from leaking in the earlier years

Dana67Dart said
In regards to not needing one due to somthing in the wheel cyl. I have NEVER heard of that and with all due respect, do not think it is accurate

sometime in the early 70's they moved the valve from the MC to the wheel cylinders via the metal cups. the rebuild kits for the wheel cylinders usually come with new ones. they can also be added to older ones that didn't have them. i've done a disk/drum MC 4 wheel disk conversion by removing it from the MC, and just using an otherwise stock disk/drum MC. works fine. but an other wise stock drum/drum converting to disk/drum, it's easiest to just get a disk/drum MC