Mopar 5015181AA Valve-Proportioning

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All non-ABS models feature two screw-in Brake Proportioning Valves that balance front to rear braking by limiting the rise in hydraulic pressure in the rear brake lines when it exceeds a factory-established safe level. Under light pedal pressure, full hydraulic pressure is allowed to the front and rear brakes, but above a certain pressure known as the "split point," the valves reduce pressure increase to the rear brakes according to a predetermined ratio, decreasing the chance of rear wheel lock-up and skidding. In contrast, models equipped with ABS utilize Electronic Brake Distribution (EBD) to control rear wheel slip without Brake Proportioning Valves. If either rear wheel skids prematurely during hard braking, it may indicate a defective Brake Proportioning Valve, necessitating immediate attention from a dealer service department, where special pressure gauges are required for diagnosis. Caution is advised as brake fluid can damage paint; therefore, all painted surfaces should be covered, and care should be taken to avoid spills. To service the Brake Proportioning Valve, loosen the brake hydraulic fluid lines using a flare-nut wrench to prevent damage, disconnect the lines, and plug their ends to avoid fluid loss and dirt entry. Unscrew the valve from the master cylinder, install a new O-ring on the new valve (discarding the old one if reusing the old valve), lubricate it with clean brake fluid, and then screw in the new valve, tightening it to the specified torque. The installation process is the reverse of removal, followed by bleeding the brake system.