This is a great after market valve that can be used on  Ford F150,F250,F350,Bronco with disc brakes.

Brand new Disc/Drum COMBINATION VALVE for front disc & rear drum brake systems.

BRAKE PROPORTIONING VALVE, Ford F150,F250,F350,Bronco

Made from Solid Brass 

We welcome any questions   this is best used on pre 1979 applications.