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.

Two proportioning valves are used on vehicles without ABS. One valve is used for each rear brake hydraulic circuit. The proportioning valves are located in the junction block. Proportioning valves balance front to rear braking by controlling (at a given ratio) brake hydraulic pressure of the rear brakes above a preset level (split point). On light pedal applications, equal brake pressure is transmitted to both the front and rear brakes. On heavier pedal applications, through the uses of proportioning valves, the pressure transmitted to the rear will be lower than the front brakes. This prevents premature rear wheel skid. If hydraulic pressure is lost in one-half of the diagonally split brake hydraulic system, the operation of the proportioning valve in the remaining half is not affected.