From my 2006 owner's manual:
Brake System Indicator
The brake system indicator normally comes on when you turn the ignition switch to ON (II), and as a reminder to check the parking brake. It will stay on if you do not fully release the parking brake.
If the brake system indicator comes on while driving, the brake fluid level is probably low. Press lightly on the brake pedal to see if it feels normal. If it does, check the brake fluid level the next time you stop at a service station.
If the fluid level is low, take the vehicle to your dealer and have the brake system inspected for leaks or worn brake pads.
Brake System Indicator
The brake system indicator normally comes on when you turn the ignition switch to ON (II), and as a reminder to check the parking brake. It will stay on if you do not fully release the parking brake.
If the brake system indicator comes on while driving, the brake fluid level is probably low. Press lightly on the brake pedal to see if it feels normal. If it does, check the brake fluid level the next time you stop at a service station.
If the fluid level is low, take the vehicle to your dealer and have the brake system inspected for leaks or worn brake pads.