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Cars with front discs/rear drums or different-size tires need a proportioning valve to fine-tune brake balance. Stock nonadjustable valves kick in after system pressure reaches a preselected level, then deliver a set brake-fluid percentage to the front or rear brakes. Adjustable valves like Baer’s allow varying the cut-in point. Keep in mind that a prop valve doesn’t reduce pressure in the system, only the rate at which fluid is applied to the rear brakes. View Related Article
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