1968 Chevy Chevelle Classic Performance Products Brakes Adjustable Proportioning Valve
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This is the adjustable proportioning valve in CPP's master cylinder. Note the concentric Allen screws-which separately control the max pressure to the rear circuit (innermost 1/8-inch Allen wrench), and the proportion of the rear circuit relative to the front circuit (1/4-inch Allen wrench). CPP provides detailed instructions with its master cylinder kit on maximizing your rear brake performance. View Related Article
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