The vehicle brake system consists of two hydraulic circuits. If one circuit is not working, the remaining circuit can still work to stop the vehicle. For normal braking performance, both circuits need to be working
If the warning light comes on, there is a brake problem. Have the brake system inspected right away.
Warning
The brake system might not be working properly if the brake system warning light is on. Driving with the brake system warning light on can lead to a crash. If the light is still on after the vehicle has been pulled off the road and carefully stopped, have the vehicle towed for service.

This light should come on briefly when the ignition is turned to ON. If it does not come on then, have it fixed so it will be ready to warn if there is a problem.
When the ignition is on, the brake system warning light will also come on when the parking brake is set. The light will stay on if the parking brake does not fully release. If it stays on after the parking brake is fully released, it means there is a brake problem.
If the light comes on while driving, carefully pull off the road and stop. The pedal may be harder to push or may go closer to the floor. It may take longer to stop. If the light is still on, have the vehicle towed for service. See Towing the Vehicle.
Service Vehicle Soon Light
Antilock Brake System (ABS) Warning LightOverview (Radio with Touchscreen)
1. VOL
(Volume)
Press to decrease or increase the volume.
2. (Power)
Press and hold to turn the power on or off.
3. (Home Page)
Press to go to the Home Page. See Home Page (Radio with Touchscreen).
...
Engine Front Cover Gasket Installation
Clean the sealing surfaces and remove all remains of old sealing compound
material.
Note: The thickness of the sealing bead should be 2 mm (0.0787 in).
Apply sealing compound to the shown areas (1) and (2). Refer to Adhesives,
Fluids ...
Brake fluid
Basic information
For detailed specifications regarding brake fluid for your Nissan Armada, refer
to the section "Capacities and recommended fluids/lubricants" in the official documentation.
Maintaining the correct brake fluid condition in the Nissan Armada is essential
for ensuring ...