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

DRP Active: Scan tool displays: Yes/No- Display indicates the state of the DRP.

DRP Disabled: Scan tool displays: Yes/No- Display indicates the state of the DRP.

Park Brake Switch: Scan tool displays: Applied/Released - Display indicates the state of the brake switch.

Red Brake Warning Indicator: Scan tool displays: Off/On - Display indicates if the red BRAKE warning indicator is currently ON.