The red "Brake SystemWarning Light" will turn on when the ignition switch is turned to the ON position and may stay on for as long as four seconds.
If the "Brake System Warning Light" remains on or comes on while driving, it indicates that the brake system is not functioning properly and that immediate service is required. If the "Brake System Warning Light" does not come on when the ignition switch is turned to the ON position, have the light repaired as soon as possible.