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 LightNavigation
OnStar navigation requires the Directions and Connections service plan.
Press to receive directions or have
them sent to the vehicle navigation screen, if equipped.
Destinations can also be forwarded to the vehicle from MapQuest.com.
The OnStar mapping database is continuously updated. For cov ...
Front Fog Lamp Replacement
Preliminary Procedures
Raise and support the vehicle. Refer to Lifting
and Jacking the Vehicle.
Remove the front bumper fascia. Refer to Front Bumper Fascia
Replacement.
Disconnect fog lamp bulb socket electrical connector.
Front Fog Lamp Screws (Qty: 3)
Caution: Refer t ...
Steering Gear Boot Replacement
Special Tools
CH-804 Drive Axle Seal Clamp Pliers
Removal Procedure
Remove the steering linkage outer tie rod. Refer to Steering Linkage Outer
Tie Rod Replacement.
Remove the steering linkage inner tie rod nut (1).
Remove the steering gear outer boot clamp (2).
Loosen the st ...