1991 Buick Century

Brakes problem
1991 Buick Century 6 cyl Two Wheel Drive Automatic 150k miles

The brake light will not go out. I have bled all wheel cylinders and the metering valve. I have also disconnected and grounded the sensors at the brake release and at the metering valve. There is no leak in the lines, the brake fluid is topped off. The light stayed on through all of that. Any suggestions.
October 19, 2009.

There is a sensor in the master cylender that turns the light on if the fluid is low. It may be bad. Check that.