Allows elimination of 50 year old Datsun hard lines and a quality distribution for all 4 wheels. Dont forget our Wilwood Massive 1 brake Master Cylinder! Obviously the stock brake lines do not work. Please be prepared to have make your own custom hoses and fittings to adapt this valve into your application. Wilwood's new Combination Proportioning Valve substantially simplifies mounting, plumbing, wiring and brake proportioning adjustments on vehicles with custom brake systems.The combination block maintains full isolation between front and rear fluid circuits and can be used in conjunction with any tandem outlet or dual mount master cylinder assemblies. The rear circuit has a single inlet and single outlet with the adjustable proportioning valve. The front circuit has a single inlet with two outlets. It can be run as a single outlet with one outlet plugged, or used to split the plumbing on its way to the front calipers. The answer is simple - we know our products, have the technical ability and expertise to help you pick the best product for your exact vehicle setup and modifications and above all, deliver outstanding customer service with a personal touch.