Antilock Brakes / Traction Control Systems: Service and Repair

All components are serviced as assemblies and should not be disassembled


COMPUTER MODULE
1. Disconnect battery ground cable.
2. On all models, disconnect wiring harness from RABS module.
3. On Ranger/Bronco II models, remove module to instrument panel retaining screws behind center of instrument panel.
4. On Aerostar models, remove module to instrument panel anti-skid plate retaining screws on lefthand side of engine cover under instrument panel.
5. On E-Series models, remove parking brake actuator assembly as follows:
a. Loosen adjusting nut at equalizer.
b. From inside engine compartment, remove nuts attaching actuator assembly to cowl.
c. From under instrument panel, remove one bolt attaching actuator assembly to lower flange of instrument panel.
d. Remove parking brake cable from actuator assembly by compressing conduit end fitting prongs using a 1/2 inch box wrench.
e. Remove actuator assembly.
6. On all models, remove two module attaching screws, then the module.
7. Reverse procedure to install, then check system for proper operation.




REAR ANTI-LOCK BRAKE SYSTEM (RABS) VALVE
1. Disconnect and plug brake lines from valve.
2. Disconnect wiring harness, then remove valve attaching nuts and valve from frame rail.
3. Position new valve onto frame rail, then install and torque attaching nuts to 15 ft. lbs.
4. Reconnect wiring harness and brake lines, then perform system brake bleeding procedures as required.


REAR ANTI-LOCK BRAKE SYSTEM SENSOR
1. Disconnect speed sensor harness connector.
2. Remove retaining bolt, then pull sensor from axle housing.
3. Clean axle mounting surface, then install sensor as follows:
a. Lubricate sensor O-ring with engine oil. If old sensor is to be reused, replace O-ring.
b. Grasp sensor at sides, then push fully into axle housing, ensuring that mounting flange hole aligns with threaded hole in axle housing.
c. Install retaining bolt and torque to 27 ft. lbs.


EXCITER RING
The exciter ring is pressed onto the differential case. Replacement requires removal of the case from the axle housing. Upon removal, the ring should be discarded and replaced with a new unit. Refer to the ``Drive Axle Service'' section for differential case removal.