Height Sensing Proportioning Valve - Service
84ford16
Article No. 84-7-9
BRAKE - HEIGHT SENSING PROPORTIONING VALVE - F250 (4x2) 7300-7800 GVWR
LIGHT TRUCKS 1984 F250
The height sensing brake proportioning valve (E4TZ- 2B547-A) was released for Job #1 1984 on F250 (4x2) 7300-7800 GVWR vehicles. This valve proportions rear brake pressure in the empty-vehicle condition and provides full braking pressure to the rear brakes in the loaded-vehicle condition.
The valve is located on the number five crossmember and is activated through a linkage system that is connected to the axle housing cover of the rear axle assembly. The following servicing procedure is suggested:
1. Raise vehicle on hoist and allow the rear suspension and rear axle to hang in full rebound position. (Rear shock absorbers must be connected to rear axle.)
2. Remove both rear wheels and tires.
FIGURE 5:
FIGURE 6:
3. Disconnect both brake tube assemblies (hydraulic lines) from the sensing valve (Refer to Figures 5 and 6).
4. Remove linkage assembly (2C193) from the sensing valve assembly (2B547).
5. Remove sensing valve assembly (2B547) from valve mounting bracket (2B546).
6. Position and attach a new sensing valve to mounting (2B526) bracket with two bolts.
7. Connect the two brake tubes to the sensing valve.
8. Connect linkage assembly (2C193) to the sensing valve shaft. Squeeze the plastic bushing of the link assembly onto the serrated section of the valve shaft, using large groove-joint type pliers.
FIGURE 5:
NOTE: Refer to Figure 5. Pivot joint of linkage assembly must face toward front of vehicle.
9. Install nut securing link assembly to valve shaft. Torque to 8 ft.lbs.
10. Bleed brake system.
11. Install wheels and tires.
12. Lower vehicle.
NOTE: The valve will automatically become operational when the vehicle's suspension is in the "curb position".
FIGURE 6:
When servicing other rear suspension components (axle assembly, rear springs, fuel tank, etc.), remove the two nuts (Figure 6), attaching the sensing valve linkage (2C193) to the rear axle cover plate. This will eliminate the need to reset the brake valve.
A new sensing valve assembly will have the shaft preset and secured internally. If the valve shaft of any valve turns freely - DO NOT USE. The height/load sensing brake proportioning valve (2B547) is not to be serviced or disassembled. It must be replaced as a complete assembly. If the linkage assembly (2C193) has been damaged or broken, a new sensing valve assembly must also be installed.
PART NUMBER PART NAME CLASS
E4TZ-2B547-A Height Sensing C
Proportioning Valve
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP2B547A84
TIME: 1.0 Hr. DLR. CODING: Basic Part No. 2B547
Code: Appropriate defect code