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 LightBody Side Trim Panel Replacement (Sedan)
Body Side Trim Panel Replacement
Callout
Component Name
Preliminary Procedures
Remove rear side door opening floor carpet retainer. Refer to Rear
Side Door Opening Floor Carpet Retainer Replacement.
Remove body rear seat ...
NissanConnect Owner's Manual
QR code (U.S. only)
The Nissan Armada NissanConnect Owner’s Manual can be conveniently accessed by
scanning the QR code shown above (U.S. models only) or by using the printed manual
included with your vehicle.
This comprehensive Nissan Armada digital guide provides detailed explanations ...
System operation
The Nissan Armada sonar system provides both visual and audible alerts under
the following conditions:
Detection of front obstacles when the transmission is in D (Drive)
Detection of both front and rear obstacles when the transmission is in R
(Reverse)
How the system alerts of obstacle ...