Height Sensing Proportioning Valve
CAUTION:
Use of aftermarket load leveling kits, air shocks or modifications that change axle-to-frame distance, will provide a false reading to brake proportioning valve. These modifications may result in unsatisfactory brake performance, which in turn could result in an accident.
CAUTION:
If the linkage is disconnected from the height sensing valve, the proper indexing will be lost and a new sensing valve must be installed. The new sensing valve assembly will have the shaft preset and secured internally. DO NOT USE if the valve shaft of the valve turns freely. The height/load sensing brake proportioning valve is not to be repaired or disassembled. It must be replaced as a complete assembly. If the linkage is damaged or broken and requires replacement, a new sensing valve must also be installed.
The height sensing proportioning valve is used on all E250, E350 and "F" Series Super Duty vehicles. The valve regulates rear brake hydraulic pressure depending on vehicle load to prevent rear wheel lockup.