Screws into the top of the brakes proportioning valve.. .. seem more then a few chipped, melted etc.
Simple to replace. - ONE per vehicle .. 78-86 eta GM Firebird Camaro Full Size, Trucks etc.. heaps.
If you need with wiring connector search for "PVSL Conn"
.jpg "57 Chev Rear 1/4 Panel LOWER section (ea)")
