Cadillac 2006 CTS Navigation System Manual page 116

Check Brake Fluid
This message will display if the ignition is in ON to
inform the driver that the brake fluid level is low. Have
the brake system serviced by your dealer as soon
as possible. See "Brake System Warning Light" in your
vehicle's owner manual.
5-24
This symbol appears with
the Check Brake Fluid
message.
Check Coolant Level
This message will appear when there is a low level of
engine coolant. Have the cooling system serviced
by your dealer as soon as possible. See "Engine
Coolant" in your vehicle's owner manual.
This symbol appears with
the Check Coolant Level
message.