Brake Fluid Level Switch
WARNING: This page is about a different car, the 2022 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The brake fluid level switch is mounted on the brake fluid reservoir and is hardwired to the ABS module. The ABS module provides a reference voltage to the brake fluid level switch and the switch is grounded through the ABS module along a separate ground circuit.