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Proper dynamic brake proportioning is an essential key to safe driving and optimized handling. Wilwood’s new Combination Adjustable Proportioning Valve substantially simplifies mounting plumbing wiring and brake proportioning adjustments on custom built vehicles or vehicles that have been equipped with upgraded brake systems. The combination block maintains full isolation between the 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 proportioning valve built inline. The front circuit has a single inlet with two outlets. It can be plumbed as a single outlet with one outlet plugged or used to split the lines on their way to the front calipers. The brake light switch is immediately activated by pressure in the front fluid circuit. The sturdy forged billet aluminum body incorporates two 5/16thru-holes for secure mounting to the frame or a reinforced chassis brace.