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The most common reason for that message to come on is due to low brake fluid, and it's the easiest thing to check. I have attached two pictures for you to see. The first is a front view of the master cylinder and the second is a side view. First, open the hood. The master cylinder is located on the driver's side, mounted to the firewall.
There is a plastic reservoir on the master cylinder (see picture 2) with a plastic screw cap on it. Clean any dirt from the reservoir and see if the fluid is to the max or full line. If it is low, top it off with the proper fluid (see the cap for dot 3 or dot 4 brake fluid requirements). Do not put anything in there other than brake fluid which meets the manufacturer's requirements.
If it is full, try this. The second picture I attached is from the side. Note there is a square electrical connector at the bottom of the reservoir. That is a sensor which is designed to let you know when the fluid is low. Carefully remove it and inspect the connections to make sure they are clean and undamaged. If they are good, gently tap the side of the reservoir with a light screwdriver so as to not damage the reservoir but hard enough to possibly release a stuck switch. Reconnect and see if the light is out.
Note: If the fluid is excessively low, you need to check for leaks. If the car starts, do not drive it until you are certain you have a solid brake pedal.
I hope this helps. Let me know what you find or if you have other questions.
Images (Click to enlarge)
Tuesday, July 24th, 2018 AT 6:54 PM