Brake Fluid Level Switch
WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
Detects the brake fluid level in reservoir tank and transmits converted electric signal from ABS Actuator And Electric Unit (Control Unit), when brake fluid level is the specified level or less.