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Old 11-03-2017, 09:47 AM   #12261
xoxoxoBruce
The future is unwritten
 
Join Date: Oct 2002
Posts: 71,105
The reluctor in the wheel bearing is what the sensor for the anti-lock brakes reads to detect the difference in speed between wheels. There's also one on the crankshaft to tell the computer exactly where the engine is in its rotation to time spark and fuel delivery.
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