Meritor LM Series Maintenance Manual page 44

7 ABS Component Replacement
FITTING AN ABS SENSOR
Sensor Block Assembly:
Apply Meritor Brake Lubricant grease to the bush.
Assemble the spring bush into the sensor mounting block.
Push the sensor fully into the mounting block. Check when the
hub and rotor has been fitted and that the sensor has been
pushed up to the pole wheel (Fig 7.7).
Refit the hub as described in Section 4 Hub Removal &
Replacement
Fig. 7.7
NOTE
: When the hub is refitted the pole wheel will push the
sensor back thus attaining the correct clearance.
CHECKING SENSOR OUTPUT
Connect the output cable to a suitable multimeter.
Rotate the hub by hand at a constant rate of approximately 30
rpm and note the maximum and minimum readings.
The minimum permissible voltage reading is 400 millivolts and the
ratio of maximum/minimum should not exceed 2.
If either values are not obtained check the installed air gap
between the sensor and pole wheel does not exceed 0.7
millimeters and the pole wheel run out does not exceed 0.2
millimeters.
If the installation is still not correct, contact the supplier of the ABS
equipment for further advice.
Disc & Drumbrake Axles
Refit the road wheel.
Remove the axle safety stands and lower the vehicle to the
ground.
Meritor Inc. LM & LC Series Axle
44