Scan Tool Data Definitions - Hydraulic Brakes
WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
Park Brake Switch The scan tool displays the current state of the parking brake switch as seen by the BCM. With the parking brake applied, the scan tool displays Applied.
Brake Fluid Level Sensor The scan tool displays the current state of the brake fluid level sensor as reported to the EBCM by the IPC. When brake fluid is below the minimum level, the scan tool displays Low.