Chevrolet Chevy II Parking Brake Indicator Bulb Size

The Chevrolet Chevy II parking brake indicator utilizes bulb size 57 and bulb size 257 for illumination. Data for the specific components covers the range from 1962 through 1968.

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
1968	57
1962-1967	257

Bulb Specifications

Description	Bulb Size
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

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Additional Notes

The Chevrolet Chevy II parking brake indicator uses two distinct bulb types across its model years: the 257 and the 57, both of which are ANSI-standard bulbs rated for use in the United States and Canada.
The 257 bulb is specified for the Chevrolet Chevy II from 1962-1967, making it the predominant bulb type across the production run covered by these specifications.
The 257 is a 12-volt, 2-watt instrument bulb available with either a festoon or BA9s base configuration.
The BA9s base is a miniature bayonet-style cap with a 9mm collar, commonly used in low-wattage instrument panel applications.
A festoon base refers to a cylindrical bulb held in place by contact at each end rather than by a socket base, which means the 257 and its base type must be matched to the specific socket design present in the vehicle.
The 1968 Chevrolet Chevy II departs from the earlier specification, using the 57 bulb instead of the 257.
The 57 is a single-filament bulb with a BA9s base, rated at 12 volts and 1 watt, drawing half the wattage of the 257.
Although both the 57 and the 257 share the BA9s base option, their wattage ratings differ, and the two bulb types are not interchangeable across the 1962-1967 and 1968 model years.