Combination/Proportioning Valve

DESCRIPTION

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.
The in-line proportioning valves are located in the rear of the vehicle, at each rear brake flex hose. The proportioning valves are not serviceable, but are a replaceable component.

OPERATION
Proportioning valves balance front to rear braking by controlling (at a given ratio) brake hydraulic pressure to 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 use 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 effected.