The tail or brake lights may be dim due to a poor ground connection inside the light socket. Failed light sockets will require replacement.Google+
Car Problem Reports
Pontiac Firebird Dim Tail or Brake Lights Due to Faulty Light Sockets
Pontiac Firebird Problem
Average Mileage: 92,500 mi (55,000 mi - 130,000 mi)
Visitor, 1993 Pontiac Firebird, 55,000 mi
Brakes lights on on then when I brake they go off. Right side is intermittent.