When i was driving home from my girlfriends house on the highway the brake light came on all of a sudden along with the damn buzzer. When i got home i checked everything, the brake fluid was good, ABS worked, E-brake was off no draggin nothing like that. Is there another cause as to why the brake light would come on and stay on. The buzzer goes off after 10mph. I shut the car off twice and same thing still on i'm stumped.. any help out there?

clean the fluid sensor in the master clyinder....and look if there is fluid underneath the master cylinder dripping down the firewall

Check the E-brake switch. I just recently had this problem. I just reached up and moved the E-brake switch, and the light went out. Some how the switch moved after I replaced the E-brake cable. All is fine now. Just check the E-brake switch, and I believe this is your problem. The chime is very annoying!!!!

I second both of the above posts. Either can set off the brake light. In my case, it was the fluid level sensor so i just unplugged it.