This is a rare metering valve for factory disc brakes on the 1967 GS400. The condition is used. $35 shipped from 48081.
Disc Brakes on the Buick A-body were a pretty rare option in '67: 286 3000-series cars (Specials/Special deluxe/GS340/GS California). There were 86,041 3000-series cars built so that's 0.3% with this option. 1,936 4000-series cars (Skylark, Sport wagon, GS400). There were 107,292 4000-series cars built so that's 1.8% with disc brakes.
