Chevrolet Brookwood Brake Bulb Size

The Chevrolet Brookwood brake light utilizes 1157 and 1034 bulb sizes according to the provided specifications for the vehicle. Available data covers the period from 1958 through 1972.

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
1969-1972	1157
1958-1961	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 Brookwood uses two brake bulb types across its model years: the 1157 for 1969-1972 and the 1034 for 1958-1961.
Both the 1157 and 1034 are ANSI-standardized bulbs recognized in the United States and Canada, each operating on a 12-volt system with a dual-filament configuration rated at 21W and 5W respectively.
The dual-filament design of both bulbs allows a single unit to serve two lighting functions, typically combining a brighter stop-light output with a dimmer running-light output within one housing.
Both bulb types share the BAY15d bayonet base, a two-pin offset base that physically locks the bulb into its socket and ensures correct filament orientation.
The 1034 is classified as a variant of the 1157, meaning the two types share the same base type and voltage but are not fully interchangeable due to differences in their electrical or photometric characteristics.
Because the 1034 and 1157 are distinct ANSI part numbers despite their similarities, substituting one for the other in the Brookwood without confirming socket and circuit compatibility carries a fitment risk.