Brake Fluid Level Switch
WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. 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.