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.

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The brake indicator light should come on briefly as the engine is started. If it does not come on have the vehicle serviced by your dealer.
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.
If the light comes on while driving, a chime sounds. Pull off the road and stop. The pedal might be harder to push or go closer to the floor.
It might also take longer to stop.
If the light is still on, have the vehicle towed for service.
Malfunction Indicator Lamp
Antilock Brake System (ABS) Warning LightVehicle Access
Specifications
Door Lock/Indicator Schematics
Door Control Module Schematics
Release Systems Schematics
Fuel Tank Filler Door Lock Actuator Replacement
Preliminary Procedure
Remove the fuel tank filler housing. Refer to Fuel Tank Filler Pipe Housing ...
Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the
Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section.
Disable the SIR System. Refer to SIR Disabling
and Enabling.
Disconnect the negative battery cable. Refer to ...
Rear Spring Replacement
Removal Procedure
Raise and suitably support the vehicle. Refer to Lifting and Jacking the
Vehicle.
Support the rear axle with a tall jack stand near the shock absorber.
Remove the lower shock bolt. Refer to Shock Absorber Replacement.
Using the tall jack stands, slowly lower the rear a ...