the low brake fluid light came on several weeks ago so i added some fluid and the light went off. after replacing the pads and pushing the pistons back the fluid was up to the full mark. this time the low brake fluid light came on after going thru a drive thru car wash. i disconnected the wire to the fluid sensor in the M/C reservoir and the lights went out. i replace the sensor in the M/C reservoir but the light came back on till i disconnected it again. the car stops well and the brakes seem fine
The fluid level sensor is pretty simple in design. Try removing it from the master, and cleaning it and re-installing it. If that does not solve the issue, I would try a junk yard. They should be used on many of the GM cars. Good luck.
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