1966 dual master cylinder
here. rock auto for $23
CARDONE SELECT Part # 131323 New CARDONE Select Master Cylinder
http://cardone.com/English/club/members/customer/ecat_brands/imageinfo.asp?PARTNUM=13-1323
not sure you even need a proportional valve with the drum brakes. most guys i know run the front brake line from the master cyl. to a tee then to each wheel..
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