brake lights

97 blazer 4+4 the rear brake lights work but the center bar brake light is out is it a seperate fuse or does the whole thing just burn out??

Always check all fuses.
Does it have 12 volt brake light power to it and good ground?

Check what MT said to check and then if that is not the issue you are looking at around $100 part and dealer only item or so I was told 3 years ago. You will not pass inspection without it working.