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The following is from the FAQ section of brickboard about cleaning the sensors and the reluctors wheels.
Gary
Cleaning Sensors. [Response: Paul Grimshaw/Bob Dietz] When cleaning the ABS sensors, it is best to avoid the urge to remove them from the dust shield as their plastic bodies can become brittle with age and crack if forced. A better cure would be to clean the wheel sensors by wiping them clean with a rag or soft brush. Another problem is the possibility of signal loss through non-waterproof connectors or cracks in the wiring or its insulation. I have seen cars where the rear wheel sensor anchor bolts were absent; with metal shavings on sensors that looked like a dead mouse (the sensor magnet is smaller than a pencil); or with broken wires inside intact insulation at the waterproof connectors both at the differential and shock towers. Most of the failures are very simple. The system isn't rocket science, which is probably why it works. But it needs to be maintained just as any high tech system needs to be maintained. [Chris Herbst] If you remove the sensors, make sure the o-rings are seated properly. I usually grease the O-rings a little bit on reinstallation.
Cleaning Reluctor Wheels. [Tip from Chris Herbst] Usually there is a big buildup of garbage in the sensor reluctor wheels that obscures the sensor from reading it. The more junk that is on the wheel, the less defined the impulses will be. I scrape them out usually with a small drift pin and then blow compressed air at them. Some of the junk doesn't blow off of the wheels with compressed air and you will need to scrape it off.You could also use an appropriately sized dowel or something with an edge that will scrape the debris from the wheels. Try not to damage them by putting surface scratches in them. If you use compressed air on brake parts, use appropriate precautions so as not to inhale the dust!
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