A8 Quattro Sedan V8-4.2L (AKB) (2002)
Wheel Speed Sensor: Testing and Inspection
Front
ABS wheel speed sensor rotor, checking
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Raise vehicle.
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Remove wheel.
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Pull ABS wheel speed sensor out of wheel bearing housing.
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Check rotor for dirt and damage (arrow).
Note:
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If ABS wheel speed sensor rotor is damaged or dirty, remove drive axle. If damaged, replace outer constant velocity joint together with ABS
wheel speed sensor rotor.
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To clean rotor, release collar bolt at drive axle and slide drive axle inward.
WARNING: Vehicle must be resting on its wheels when loosening and tightening collar bolt.
-Risk of accident-
Note: Always use a new collar bolt!
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Tighten collar bolt to 190 Nm and turn an additional 180°.