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Proportioning Valve Kit 4x4 disc Brass (see details) - Bottom Mount Kit
Reviews

GM Kit for Disc/Disc For use with 3/8" Ports Master Cylinders  Bottom Mount Zinc Bracket Steel Lines, 
Bracket Proportioning Valve Plug Brass Proportioning Valve (2) 3/8-24" ports for the front
 brakes (1) 9/16-18" port for the rear Dash warning light... 
Ideal for custom work or 4 wheel disc conversions.
All based on the GM Prop valve.
 
ALSO BUY A PVTOOL if you don't have one.. listed under "PVTOOL"
We purposely have the # "PVTOOL"  cheap so you both have one for future use and maybe a mechanic if your using one will need it and probably not be aware of them etc.. but so you will do it right to start with , get one, otherwise you  most likely stuff up a new proportioning valve.