Chevrolet Biscayne Brake Bulb Size

The Chevrolet Biscayne brake light utilizes 1157 and 1034 bulb sizes according to the provided technical data for the vehicle lighting system. The information covers a span from 1958 through 1972 for the specified automotive components.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1964-1972	1157
1958-1963	1034

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1034

Other Locations

Additional Notes

The Chevrolet Biscayne brake bulb specifications cover the 1958-1972 model years, with two distinct bulb types used across that span: the 1034 and the 1157.
The 1034 bulb was specified for the Chevrolet Biscayne from 1958-1963, while the 1157 replaced it for the 1964-1972 model years.
Both the 1034 and 1157 are ANSI-standardized bulbs recognized in the United States and Canada, each operating at 12 volts with a dual-filament design rated at 21W and 5W respectively.
The dual-filament construction of both bulb types allows a single unit to serve two functions, with the higher-wattage filament typically handling the brake signal and the lower-wattage filament handling a secondary role such as running light duty.
Both bulbs share the BAY15d bayonet base, a two-pin offset base type that physically prevents incorrect insertion by positioning its two pins at different heights.
The 1034 is classified as a variant of the 1157, meaning the two share the same base type and general electrical configuration, though they are not confirmed as interchangeable in these specifications.