The Buick Skyhawk brake light utilizes 1157 and 2057 bulb sizes depending on the specific production period for the vehicle. Provided information covers the span from 1975 through 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buick Skyhawk brake light specifications cover model years 1975-1989, with two distinct bulb types used across that span depending on the year.
The 2057 bulb is the most frequently specified type in these records, appearing as the brake bulb for the Skyhawk across the 1983-1989 model years.
The 2057 is a dual-filament bulb rated at 12V with a high-filament draw of 26.9W and a low-filament draw of 8W, mounted on a BAY15d bayonet base, and it conforms to ANSI standards recognized in both the US and Canada.
The 1157 bulb is specified for the Buick Skyhawk brake lights from 1975-1982, and it shares the same BAY15d bayonet base as the 2057 but operates at lower wattage ratings of 21W and 5W across its two filaments.
Because the 2057 and 1157 share the BAY15d bayonet base, they are physically interchangeable in terms of socket fitment, though their wattage outputs differ, with the 2057 producing a notably brighter high-filament output.
The 1156 bulb is specified exclusively for the Center High Mount Stop Light (CHMSL) on the Skyhawk for model years 1986-1989, a feature that was federally mandated for passenger cars beginning with the 1986 model year.
Unlike the 2057 and 1157, the 1156 is a single-filament bulb rated at 12V and 21W, and it uses a BA15s bayonet base rather than the BAY15d base found on the dual-filament brake bulbs.
The BA15s base of the 1156 and the BAY15d base of the 1157 and 2057 are not interchangeable, as the pin configurations differ to prevent incorrect installation between single- and dual-filament applications.
All three bulb types in these specifications conform to ANSI standards applicable in both the US and Canada, indicating consistent regulatory compliance across the listed fitments.
The transition from the 1157 to the 2057 for the standard brake light position between the 1982 and 1983 Skyhawk represents a shift to a higher-output bulb within the same socket family.