Chevrolet Caprice Brake Bulb Size

Additional Notes

• The 1157 bulb is the most historically prevalent brake bulb type in the Chevrolet Caprice specifications, appearing across the 1966-1982 model years. It is a dual-filament, 12V bulb rated at 21W/5W with a BAY15d bayonet base, conforming to ANSI standards for the US and Canadian markets.
• The 2057 bulb shares the same BAY15d bayonet base as the 1157 and carries an identical 12V rating, but operates at a higher wattage of 26.9W/5W on its primary filament. This higher output distinguishes it as a brighter variant of the 1157.
• The Chevrolet Caprice (1983-1992) uses the 2057 bulb for the brake light, replacing the 1157 used in earlier model years. Because both bulbs share the BAY15d base, physical fitment between them is possible, but their differing wattage outputs means they are not functionally interchangeable without consideration of the electrical circuit.
• The 7443 is a dual-filament wedge bulb of the T20 type, rated at 12V and 21W/5W. Unlike the 1157 and 2057, it uses a wedge-style base rather than a bayonet mount, making it physically incompatible with sockets designed for BAY15d bulbs.
• The Chevrolet Caprice (2011-2017) uses the 7443 bulb for the brake light. The shift to a wedge-base bulb from the bayonet-base types used in earlier generations reflects a change in socket design that prevents cross-generation substitution.
• The Center High Mount Stop Light specifications for the Caprice include four distinct bulb types across the 1986-1992 model years: the 2057, 1156, 1155, and 211-2. This variety indicates that the same sub-part position used different socket configurations depending on the model year.
• The 1156 and 1155 are both single-filament bulbs with a BA15s bayonet base, each rated at 12V and 21W. The 1155 is listed as a variant of the 1156, and their shared base type and wattage rating place them in close proximity as potential substitutes, though they carry separate ANSI designations.
• The 211-2 is a festoon-type bulb with an SV8.5 base, 41mm in length, rated at 12V and 12W. Its festoon form factor and lower wattage set it apart from all other bulb types in these specifications, and its unique base type means it is not interchangeable with any of the bayonet or wedge-base bulbs listed.
• The 1989 Caprice Center High Mount Stop Light uses the 211-2 festoon bulb, while the 1988 and 1990 models use the 1156. These adjacent model years require entirely different bulb base types for the same lighting position, meaning a bulb sourced for one of those years cannot be fitted to the other without a socket adapter.
• Across all brake bulb positions in these specifications, every bulb type conforms to ANSI standards applicable to the US and Canadian markets. None of the listed bulbs reference ECE or other international standards, indicating the specifications are scoped to North American fitment.