http://cgi.ebay.com/ebaymotors/ws/eB...l?ViewItem&amp ;item=390027574685&sspagename=STRK%3AMEWAX%3AI T&view item=





This link is to a "HOLD OFF VALVE" for disc brakes used on 67-68 cars only. I recently converted to chevelle front pdb''s and need to know if this should be part of the upgrade?


Also, is there a different dia. rear brake wheel cylinder when using power fdb''s,





Thanks, Bud