The Plymouth Caravelle brake light requires a 2057 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 1985 through 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Caravelle uses the 2057 bulb for the brake light function across the 1985-1988 model years.
The 2057 is a dual-filament bulb with a BAY15d bayonet base, operating at 12V with filament ratings of 26.9W and 8W for its high and low circuits respectively.
As a dual-filament design, the 2057 serves both stop and tail light functions within a single housing, with the higher-wattage filament dedicated to the brake signal.
The 2057 is a brighter variant of the 1157, sharing the same BAY15d bayonet base. While the two types are physically similar, substituting a 1157 for a 2057 results in reduced brake light output.
The Center High Mount Stop Light on the Plymouth Caravelle uses the 921 bulb for the 1986-1988 model years.
The 921 is a single-filament wedge-type bulb in a T15 form factor, rated at 12V and 16W, and is dedicated solely to the stop light function in that position.
Both the 2057 and 921 conform to ANSI standards applicable in the United States and Canada.
The 921 wedge base differs fundamentally from the BAY15d bayonet base of the 2057, making the two bulb types non-interchangeable with each other.