See Figures 1, 2, 3 and 4
The proportioning valve is actually a three part unit, containing a metering valve, pressure differential valve and brake pressure warning switch. If any of these functions fails, the unit must be replaced. It is not repairable. On the Wagoneer, Cherokee and J-Series truck, through 1983, two different types of valves were used. On models in the early 1970s, a D-type valve was used, in the late 1970's, a W-type was also used. They are similar in appearance and the only significant difference is in the method of holding open the valve during bleeding. Type W uses tool J-26869; type D uses tool J-23709. The valves are not interchangeable, however. In late 1983, the W-type became the only type used on the Grand Wagoneer and J-Series truck.
On the Wagoneer, Cherokee and J-Series truck through 1983, the valve is located on the frame rail, directly under the driver's position.
REMOVAL & INSTALLATION Types D and W Proportioning Valve
- Disconnect the brake lines at the valve and plug them.
- Unbolt and remove the valve.
- Installation is the reverse of removal. Bleed the system.