3 of the 5 brake lights will not work when I compress the brake. They do however light up when I turn the headlights on (but when I hit the brake only 2 of them get brighter). I have checked the bulbs and they are all good. I just checked the fuses last night and nothing was out (but my radio doesn't work now). I looked at the brake light switch and it seems fine. I am not exactly sure how it is supposed to look but the button would go in and out with ease when I hit the brake. Could you give me some theories on why my lights are doing this and how to fix it?