Chevrolet C60 Brake Bulb Size

Additional Notes

• The 1157 bulb is the dominant brake bulb type across the Chevrolet C60 specifications, appearing in every model year from 1960-1983 and again from 1985-1988.
• The 1157 is a dual-filament bulb operating at 12 volts with a 21W/5W power rating, where the higher wattage filament serves the brake and turn signal functions and the lower wattage filament serves the running light function.
• Both bulb types in these specifications use the BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect insertion by positioning the two pins at different heights on the base.
• The 2057 bulb is specified exclusively for the 1984 Chevrolet C60, setting that model year apart from all others in the dataset.
• The 2057 operates at 12 volts with a 26.9W/8W power rating, drawing notably more wattage on both filaments than the 1157, which accounts for its classification as a brighter variant.
• Both the 1157 and 2057 conform to ANSI standards recognized in the United States and Canada, placing them within the same standardized bulb numbering system used across North American automotive applications.
• Because the 1157 and 2057 share the same BAY15d bayonet base, the two bulb types are physically interchangeable in terms of fitment, though their differing wattage ratings mean they are not electrically equivalent replacements for one another.