GM Service Manual Online
For 1990-2009 cars only
Brake Fluid Level Status: The scan tool displays OK or Low. The status of the brake fluid level sensor signal.

Brake Pressure Sensor: The scan tool displays 0-2900 psi. Displays the amount of pressure being applied to the brake system.

Brake Pressure Sensor: The scan tool displays 0-5 volts. Displays the signal from the brake pressure sensor.

Brake Warning Indicator: The scan tool displays On or Off. Indicates if the brake warning indicator is commanded On.