The ABS and TRACS OFF Idiot Lamps turn on and off intermitently in my 850. I can be driving around on dry pavement with very little throttle input, and the traction control will engage (audible whirring of the ABS Modulator Pump and stiff pulsating brake pedal - quickly applied to confirm my suspicion). This will light the lamps. Likewise, I can be braking on a dry surface at a low decel, and the ABS will engage. This will also light the lamps and shut off ABS/TRACS.

I think I've root caused the problem to the ABS Wheel Speed Sensors. The wheel speed sensors appear to be magnetic pickups that read gear teeth machined into the wheel bearing. I've checked the wiring visually, and all the connections appear to be sound. Is it possible that because I'm using semi-metallic brake liniings, small metallic fragments have collected on the magnetic pickup for the wheel speed sensors, causing the ABS/TRACS errors? If so, what's the best way to clean the sensors off? Has this phenomonon occured to anyone else? Any other ideas?

Thanks,
--Andy