I searched on this and most people say it's because the pads need to be changed or the brake fluid is low. Today I was making a U-turn and the brake light popped up on the dash then went away. What do you guys think?

 

Most likely your brake fluid is low.

 

the same thing has been happening i have looked at my fluid level and is getting low but my lights has been popping on and off and i look tonight after i got off work and the light is off