The Buick Electra brake light utilizes 2057, 1157, and 1034 bulb sizes depending on the specific production period for the vehicle. Provided data covers the range from 1959 through 1990.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buick Electra brake light specifications cover three distinct bulb types across the main brake light position: the 1034, 1157, and 2057. All three are dual-filament bulbs rated at 12V and share the BAY15d bayonet base, making them physically similar in mounting style.
The 1034 was specified for the Buick Electra from 1959-1963. It is a dual-filament bulb with a BAY15d base rated at 12V and 21W/5W, placing it in the same general family as the 1157.
The 1157 was specified from 1964-1982, representing the longest continuous bulb fitment period in these specifications. It operates at 12V with a 21W high-filament and 5W low-filament output through a BAY15d bayonet base.
The 2057 was specified for 1983-1985, 1986, and 1990. It shares the BAY15d bayonet base with the 1157 but draws higher wattage at 26.9W on its high filament, making it the brightest of the three dual-filament types listed.
Although the 2057 and 1157 share the same BAY15d base type, they are not the same bulb. The 2057 draws noticeably more power on its high filament (26.9W versus 21W), which reflects a difference in light output rather than just a designation change.
The 1034 and 1157 share identical wattage ratings of 21W/5W and the same BAY15d base. Despite these similarities, they carry separate ANSI designations and are treated as distinct part numbers within the specifications.
The Center High Mount Stop Light (CHMSL) position on the Buick Electra uses the 1156 for both 1986 and 1990. Unlike the main brake bulbs, the 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
The BA15s base of the 1156 is not interchangeable with the BAY15d base used by the 1034, 1157, and 2057. The two base types differ in pin alignment, and substituting one for the other is not supported by these specifications.
The CHMSL position uses a single-filament bulb because that circuit serves only one switching function, whereas the main brake light position uses dual-filament bulbs to serve both the running light and brake light functions through a single housing.
All bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada, indicating consistent regulatory compliance across the full model year range covered.