residual pressure valve at master cylinder (for rear drum), internal components.

1 mistake I made, when people said you just need to gut the internals of the OEM residual valve that's on the master cylinder rear brake line, you do need to leave 1 piece. There is a little black plastic tubular piece shown here inside the spring, and that tube needs to remain in the residual valve otherwise the valve leaks.

This would be plumbed into the rear line right at the master cylinder after I replace the residual valve with the gutted one. Just would like to dial out a wee bit of rear caliper brake.

pics of prop valve. Another thing to keep in mind here is that you need the special, short little adapter line (mine is from Advance auto), that is 3/8" threaded on one end (goes in to prop valve) and 7/16ths on the other end (screws into residual valve at the MC). The one other item you need then is 1/8 NPT to 7/16ths (out to the rear brake line). I used a 90* elbow to make install fit better.