i have a 93 caprice so this may not apply, but the bulb goes into a socket underneath the assembly. you can get to it thru the trunk. you don't even need any tools to do it. open the trunk and check around underneath the brake light. Unscrew the brakelight mount and turn it so it is easy to unscrew the bulb first. Then unscrew the bulb, it may take a few tries to get it out. If you still have problems unscrew the top of the mount (they're the only screws left on the mount) then try to remove the bulb.
under the hood in black box
The Chevrolet Colorado brake light switch is quite simple to change. The brake light switch simply plugs in and out.
It is mounted on a bracket under the dash at the brake pedal. From there it is self explanatory.
Possibly defective or misadjusted brake light switch.
Find the screws to pull of the cover. Should be 2 - 4 screws. Save
Check the brake light switch on the brake pedal. Might have to replace it.
The check gauge light on the 1994 Chevrolet Caprice comes on because there is something on the gauges that requires attention. It is a good idea to take the vehicle to a mechanic when this light comes on.
Check the upper end of the brake pedal under dash
brake line has air...
what do you have to do to change the center brake light
First check the brake light fuse, if good, then test the brake light switch.
brake and abs light on , on 1994 Chevy Cavalier Z24