hello everybody thanks for getting back. here is how this started. had the airbag replaced at the dealer on Saturday. you know how they come back you got this problem that one. that's when they said two brake light bulbs out . I said I will fix that. I replaced both bulbs same thing . with headlights on all lit up and when I press brake inner two don't go brighter. I thought this was a little strange. driving home today from work I saw another mustang and saw the brake lights are the the same as mine. after your replies I am assuming that this is normal. teck at dealer not up to speed on this one. lol thanks for your replies.