Brake Proportioning/Combination Valve: Description and Operation

ANTILOCK AND NON-ANTILOCK BRAKES

Proportioning Valve With ABS And Non-ABS TLEV:

Two in line proportioning valves are used on both the Antilock Brake System and all Non-Antilock Brake applications. One valve is used for each rear brake hydraulic circuit.
On light pedal applications equal brake pressure will be transmitted to the front and rear brakes. On heavier pedal applications the pressure transmitted to the rear will be lower than the front brakes. This will prevent premature rear wheel skid. If hydraulic pressure is lost in one half of the diagonally split system, the operation of the proportioning valve in the remaining half is not effected.
The in-line proportioning valves are located in the rear of the vehicle, at the rear brake flex hose. The proportioning valves are not serviceable, but are a replaceable component.