I am having trouble with the brake sensor light. About 15,000 miles ago it was coming on, and we replaced the front brake pads. Afterwards, it stayed on, so they put in new sensors. That worked for a while, but for the last 10,000 miles, the sensor light periodically will come on, and then after some miles will go off.
I have had the brake pads checked twice, and have been told they are fine. I have also checked the level of the brake fluid and it is fine.
Now the light stays on all the time.
Any suggestions?

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. 300 TD Turbodiesel 1985-W123