PV71 proportioning valve operation

As suggested above, I installed an adjustable prop valve on the rear line ($28). As many do, I kept the factory distribution block as a "tee" for the front lines. You plug the rear port and put a 1/4-3/16 inv flare adapter in the top port. Use a 3/16" coupler to connect to existing rear brake line. All fittings are in bubble packs at Autozone. Search for posts here.