The Cadillac Fleetwood brake light utilizes 1157, 2057, and 3057 bulb sizes depending on the specific production period for the vehicle. The provided data covers a range from 1965 through 1996.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Cadillac Fleetwood brake light specifications cover model years 1965 through 1996, with three distinct bulb types used across that span: the 1157, 2057, and 3057.
The 1157 is the most historically prevalent brake bulb in these specifications, fitted to the Cadillac Fleetwood across model years 1965-1982. It is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with filaments drawing 21W and 5W respectively.
The 2057 shares the same BAY15d bayonet base as the 1157 and is also a dual-filament ANSI-standard bulb, but operates at higher wattage of 26.9W and 8W. It is specified for the Fleetwood across 1983-1988 and again for 1993-1996.
Because the 2057 and 1157 share the BAY15d bayonet base, they are physically interchangeable in terms of socket fitment, though their wattage ratings differ. Substituting one for the other without accounting for those differences may affect circuit load and light output.
The 3057 is a dual-filament wedge-type bulb in a T25 form factor, rated at 12V, 27W/7W. Its wedge base is mechanically distinct from the BAY15d bayonet base used by the 1157 and 2057, making it non-interchangeable with those types without a socket adapter.
The 3057 is specified exclusively for the Fleetwood brake light during model years 1989-1992, representing a departure from the bayonet-base bulbs used in surrounding years.
The Center High Mount Stop Light (CHMSL) specifications apply to model years 1986-1996. This position uses single-filament bulbs exclusively, in contrast to the dual-filament bulbs used in the main brake light position.
The 1156 and 1141 are both single-filament bulbs sharing the BA15s bayonet base, each rated at 12V and 21W. The BA15s base differs from the BAY15d base used by the 1157 and 2057 in the offset positioning of its locating pins, making them incompatible with the main brake light socket.
The 1141 is specified for the CHMSL on the Cadillac Fleetwood for model years 1993-1994, while the 1156 is specified for all other CHMSL-equipped years in the dataset. Despite sharing identical base type and wattage ratings, the 1141 and 1156 are listed as separate part numbers under ANSI standards.
All five bulb types across both positions conform to ANSI standards applicable in the United States and Canada, indicating standardized dimensional and electrical tolerances across the range.