Chevrolet Biscayne Parking Brake Indicator Bulb Size

The Chevrolet Biscayne parking brake indicator utilizes bulb sizes 194, 57, and 257 depending on the specific production period for the vehicle. Available data covers the range 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
1967-1972	194
1966	57
1963-1965	257
1962	57
1959-1961	257
1958	57

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57
ANSI standard (US & Canada). Festoon or BA9s base instrument bulb. 12V, 2W.	257

Other Locations

Additional Notes

The Chevrolet Biscayne parking brake indicator uses three distinct bulb types across its 1958-1972 model years: the 194, the 57, and the 257, all of which conform to ANSI standards applicable in both the United States and Canada.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, making it the highest-wattage bulb among the three types specified for this application.
The 57 is a single-filament bulb with a BA9s base, rated at 12V and 1W, representing the lowest wattage of the three bulb types in these specifications.
The 257 is an instrument bulb available in either a festoon or BA9s base configuration, rated at 12V and 2W, placing it between the 57 and 194 in terms of power draw.
The 194 wedge bulb is specified for the Chevrolet Biscayne across the 1967-1972 model years, representing the longest continuous run of a single bulb type in these specifications.
The 257 bulb is specified for 1958-1960, 1961, 1963-1965, with the 57 appearing in 1958, 1962, and 1966, indicating that the parking brake indicator socket type changed multiple times across the production run.
The BA9s base is shared between the 57 and the 257 bulb types, though the two are not interchangeable due to their differing wattage ratings and physical form factors, which include the festoon option exclusive to the 257.
The transition to the 194 wedge base in 1967 represents a shift away from the BA9s base family entirely, meaning bulbs from earlier model years are not compatible with 1967-1972 Biscayne parking brake indicator sockets.