2004 corvette

the brake lights aren't turning on. we checked the fuses and they are fine. Please help.

Use a known good Light / Brake light bulb for troubleshooting.

Did you test the fuses with a test light, both sides? Sometimes, fuses can look okay, but be bad.

If the fuse really is good, use a test light on the brake pedal switch.

where is the brake relay located, please be specific.

Some time brake light looks ok but it has internal problem. Test fuse with test light which give exact result.