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Proportioning Valves

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Vehicles without ABS have 2 proportioning valves. One proportioning valve controls the right rear brake, and the other proportioning valve controls the left rear brake. The proportioning valves are located in the junction block. Vehicles with ABS do not have proportioning valves, ABS vehicles use Electronic Variable Brake Proportioning (EVBP) which is built into the Integrated Control Unit (ICU).
NOTE: If premature wheel skid occurs on a hard brake application, it could be an indication that a malfunction has occurred with one of the 2 rear brake proportioning valves. Test the valve that controls the side of the vehicle on which the skid occurs. Both proportioning valves have the same pressure specifications and are tested in the same way.
  1. If left rear proportioning valve is suspect, disconnect tube nut fitting at master cylinder primary port (port closest to power brake booster). Install Adapter (8494-2) in its place on the master cylinder.
  2. If right rear proportioning valve is suspect, disconnect tube nut fitting at master cylinder secondary port (port furthest from power brake booster). Install Adapter (8494-2) in its place on the master cylinder.
  3. Connect primary brake tube to Adapter.
  4. Install Pressure Gauge (C-4007-A) onto adapter.
  5. Tighten all tube nut fittings to specification. See TORQUE SPECIFICATIONS  .
  6. Remove screw attaching cruise control servo to upper radiator closure panel. See Fig 1 .
  7. Remove screw fastening the washer filler tube to the upper radiator closure panel. See Fig 1 .
  8. Remove nut and screw securing Transmission Control Module (TCM) to vehicle. See Fig 2 .
  9. Lift transmission control module (with cruise control servo attached) from its mount, leaving wiring harness attached. Move it off to side (toward engine), making sure not to strain wires and cruise control servo cable.
  10. Clean any debris away from fittings on top of junction block.
  11. Remove chassis brake tube leading to either left rear or right rear brake at junction block. See Fig 3 .
  12. If left rear proportioning valve is suspect, install Adapter (8494-3) in its place on the junction block.
  13. If right rear proportioning valve is suspect, install Adapter (8494-4) in its place on the junction block.
  14. Install Pressure Gauge (C-4007-A) onto Adapter.
  15. Tighten all tube nut fittings. See TORQUE SPECIFICATIONS  .
  16. Bleed any air out of the system. This includes bleeding the air from the hose between the pressure test fitting and Pressure Gauge, which is done at the Pressure Gauge.
  17. With aid of a helper, apply pressure to brake pedal until reading on proportioning valve inlet gauge (at master cylinder) is 1000 psi. Check pressure reading on proportioning valve outlet gauge (at junction block outlet to rear brake). If proportioning valve outlet pressure is not 525-625 psi, replace junction block (with internal proportioning valves). If pressure is within specification, go to next step.
  18. Remove Pressure Gauge and Adapter (8494-3 or 8494-4) from junction block.
  19. Reinstall chassis brake tube onto junction block port. Tighten tube nut fitting to specification. See TORQUE SPECIFICATIONS  .
  20. Install TCM (with cruise control servo attached) in its normal position. Install corresponding nut and screw.
  21. Install TCM mounting nut and bolt securing it in place, and tighten to specification. See TORQUE SPECIFICATIONS  .
  22. Install screw attaching washer filler tube to upper radiator closure panel. See Fig 1 .
  23. Install screw attaching cruise control servo to upper radiator closure panel. See Fig 1 .
  24. Remove pressure gauge and adapter from primary or secondary port of master cylinder.
  25. Install brake tube onto primary or secondary port of master cylinder, and tighten tube nut to specification. See TORQUE SPECIFICATIONS  .
  26. Bleed affected brake line. See BLEEDING BRAKE SYSTEM  .
  27. If no problem is found with proportioning valves, check rear wheel brake shoe linings for contamination, and ensure rear wheel brake shoes linings meet OEM material specifications. See DISC BRAKE SPECIFICATIONS  . These conditions can also cause premature rear wheel skid.
Fig 1: Locating Cruise Control Servo & Washer Filler Tube Fasteners
G00293120Courtesy of CHRYSLER CORP.
Fig 2: Removing & Installing Transmission Control Module
G00293121Courtesy of CHRYSLER CORP.
Fig 3: Identifying Proportioning Valve Connections
G00020706Courtesy of DAIMLERCHRYSLER CORP.
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