Genuine Chrysler Cirrus Brake Proportioning Valve

Chrysler Cirrus Brake Proportioning Valve Parts Questions & Experts Answers

• Valve-Proportioning
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  Q: How Do Proportioning Valves Work?

  A: All models have two proportioning valves that balance front-to-rear braking by controlling the increase in rear system hydraulic pressure above a preset level. Under light pedal pressure, the valve allows full hydraulic pressure to the front and rear brakes. But above a certain pressure - known as the "split point" - the proportioning valve reduces the amount of pressure increase to the rear brakes in accordance with a predetermined ratio. This lessens the chance of rear wheel lock-up and skidding. If either rear wheel skids prematurely under hard braking, it could indicate a defective proportioning valve. If this occurs, have the system checked out by your local dealer service department. A pair of special pressure gauges and fittings are required for proper diagnosis of the proportioning valves. While diagnosis is beyond the scope of the home mechanic, you may still save money by replacing the valves yourself. Loosen the right front wheel lug nuts, raise the front of the vehicle and support it securely on jackstands. Remove the wheel. Remove the accessory drivebelt splash shield. Loosen the brake hydraulic fluid lines from the proportioning valve with a flare-nut wrench to prevent rounding off the corners of the fittings. Back off the fittings and remove the valve from the line. Plug the ends of the lines to prevent loss of brake fluid and the entry of dirt. Installation is the reverse of removal. Bleed the brakes. Carefully test the brakes before resuming normal operation. If your vehicle was manufactured between 1995 and 1997 and equipped with ABS, the proportioning valves are mounted to the HCU and upon removal, the ABS system will be required to be bled using a DAB scan tool. We recommend you let your local dealer service department or other qualified repair shop replace the proportioning valves on these models. For 1998 and later models with ABS, loosen the appropriate rear wheel lug nuts, raise the rear of the vehicle and support it securely on jackstands. Remove the wheel. Loosen the line fitting from the proportioning valve with a flare-nut wrench to prevent rounding off the corners of the fittings. Be sure to hold the valve with another wrench to prevent the line from twisting. Detach the brake hose bracket from the upper frame rail. Unscrew the valve from the brake hose and plug the ends of the lines to prevent leakage and contamination. Installation is the reverse of removal. Fit the metal line to the proportioning valve before attaching the brake hose bracket to the upper frame rail.