The Pontiac Bonneville brake component utilizes unique bulb sizes 3057, 3357, 2057, 1157, and 1034 depending on the specific production period. Available information covers the range from 1957 through 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Bonneville brake light specifications span model years 1957 through 2003, with three distinct bulb types accounting for the majority of that range: the 1034, the 1157, and the 2057.
The 1157 is the most frequently specified brake bulb across the Bonneville lineup, covering model years 1964 through 1982. It is a dual-filament bulb with a BAY15d bayonet base rated at 12V and 21W/5W, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary role such as running light duty.
The 2057 shares the same BAY15d bayonet base as the 1157 and is physically interchangeable in terms of base type, but it operates at a higher wattage of 26.9W/8W, making it a brighter variant. The Bonneville uses the 2057 for brake applications from 1983 through 1996, and again as the outer brake bulb from 1995 through 1999.
Because the 2057 and 1157 share the BAY15d base, physical installation is possible in either socket, but the wattage difference means they are not electrically equivalent replacements. Substituting a lower-output 1157 where a 2057 is specified results in reduced brake light brightness.
The 3057, specified for the Pontiac Bonneville from 1998 through 2003, is a dual-filament wedge bulb in a T25 form factor rated at 12V and 27W/7W. Its wedge base is not compatible with the BAY15d bayonet sockets used by the 1157, 2057, or 1034 bulbs.
The 3357, specified solely for the 1997 model year brake application, is a single-filament T25 wedge bulb rated at 12V and 27W. It shares the same T25 wedge form factor as the 3057 but lacks a second filament, which distinguishes it electrically from the dual-filament 3057 used in surrounding model years.
The 1034, used on the Pontiac Bonneville from 1957 through 1963, is a dual-filament bulb with a BAY15d bayonet base rated at 12V and 21W/5W. It is described as a variant of the 1157, and while the base type is the same, fitment compatibility with later 1157 or 2057 sockets would depend on the specific socket design of the vehicle.
For model years 1986 through 1999, the Bonneville center high mount stop light uses the 1156, a single-filament bulb with a BA15s bayonet base rated at 12V and 21W. The BA15s base is distinct from the BAY15d base used by the 1157 and 2057, and the two base types are not interchangeable.
The inner brake position on the Pontiac Bonneville for model years 1995 through 1999 also specifies the 1156, while the outer brake position for those same years specifies the 2057. This means a single model year Bonneville in that range requires two different bulb types within its brake lighting system.
All bulb types specified across the Bonneville brake light data conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical ratings across the full model year range covered by these specifications.