fuse, relay or brake switch--hopefully not the ABS controller.
First check fuse 20--I think it's inside. If godd, go to next step.
The relay is usually in the engine compartment relay box, but may also be near the fuse in the car.
Swap the relay with a similar one. The horn is my favorite. If this fixes it, buy a relay for the horn.
If not, go to next step.
The brake light switch is above the brake pedal. It may have one or two connectors on it. Looks to me like yours should only have one. I have pasted a picture of it below. First look to see if the button is coming out when you push on the pedal. If not, the spring is broke inside--replace switch.
If button works, pull the connector off and use a big paper clip to connect the terminals inside the connector. If this puts the lights on, replace the switch. If not, go to the next step.
The EBCU receives the actual brake switch signal and then turns on the brake light relay. You can interrogate the relay socket to see if the EBCU is sending that ground signal to the relay socket. Use a 12 volt test light to check the socket. Hook the test light clip to engine or chassis ground, then probe the socket terminals. 2 of them should be hot. Leave your probe in one of the hot ones and take the clip off the ground point. Then have someone step on the brakes while you probe the other 2 terminals with your light clip. If one of them lights the test light brightly , the signal is coming thru. You can also verify this by pushing the relay into the socket while some has their foot on the brake. The relay shouild click if the signal is there. If the signal is there, the problem you have in the wiring from the relay socket to the brake lights.
If the signal is not there, the problem is with the ABS control unit (ouch).
Let me know if you have any questions.