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Intermittent ABS alarm

Brakes

Model: 951, Year:1989, Mileage:50,000, Type of use:Street use only
I have been fighting an intermittent ABS brake alarm for 6 months now. Here is what has been happening, the ABS brake alarm goes on immediately when the car is started. Having said that, the alarm has on a number of occasions disappeared, once even when I was driving, to only return a day, a week later. To date I have done the following: Cleaned all of the ABS sensors, checked with known good relays, the relay on the main fuse panel and the two relays on the ABS pump. On one occasion, I undid the connectors on the ABS computer and plugged it back in. This seemed to clear the problem to only have it reappear a couple of weeks later.Any suggestions, could it be something as simple as an oxidizing contacts on the ABS CPU or wiring hardness connector to the CPU?

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