There are many Vehicles in the game where regardless of the Race settings / Time of day certain parts of the Brake lights are always on / illuminated. I have noticed this on the following vehicles more might be affected.
1992 Honda NXS-R
2002 Ferrari 575M Maranello
2000 Mustang Cobra R
2003 Ferrari 360 Challenge Stradale
2000 Honda Prelude Type SH
2002 Lotus Esprit V8
1993 Porsche 968 Turbo S
1989 Porsche 944 Turbo
1993 Porsche 928 GTS