Auto Hold Switch
WARNING: This page is about a different car, the 2021 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The auto hold switch is a momentary contact, push button switch and is part of the parking brake switch.
Brake Fluid Level Switch
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.