I have a fully rebuilt Brake Proportioning Valve for an AE86 (might fit SR5s as well). All seals/o-rings have been replaced with EPDM (brake fluid compatible) seals. Everything was disassembled, soaked in a rust bath, cleaned and put back together. Sprayed it with VHT black spray paint for brake applications.
Only have 1 left. This is perfect if your valve is stuck and don't want the downtime of rebuilding it yourself. Asking $50 shipped.
Kudos,Jay