The Kia Rio5 brake light utilizes 1157 and 2357 bulb sizes according to the provided specifications for the rear lighting components. Data for the specific bulb requirements covers the period from 2006 through 2011.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kia Rio5 brake light system uses two distinct bulb types across its model years: dual-filament bayonet bulbs for the standard brake lights and a single-filament wedge bulb for the center high mount stop light.
The 1157 is the most frequently specified bulb in these brake light specifications, covering the standard brake lights on the 2007-2011 Kia Rio5. It is a dual-filament bulb rated at 12V with a 21W high filament and a 5W low filament, mounted on a BAY15d bayonet base.
The dual-filament design of the 1157 allows a single bulb to serve both the brake light function and a lower-intensity running light function, which is typical for combined stop and tail light assemblies.
The 2006 Kia Rio5 standard brake light position uses the 2357 rather than the 1157. The 2357 shares the same BAY15d bayonet base but operates at higher wattages of 26.9W and 8W, making it a physically interchangeable yet electrically distinct variant.
Because the 1157 and 2357 share the BAY15d base, they are physically compatible in the same socket, but their differing wattage ratings mean substituting one for the other affects light output.
The 921 is a T15 wedge bulb rated at 12V and 16W. It is a single-filament type, consistent with its dedicated use in the center high mount stop light, which functions only as a brake signal with no secondary running light role.
The 921 wedge base differs fundamentally from the BAY15d bayonet base used by the 1157 and 2357, meaning no interchangeability exists between the center high mount stop light socket and the standard brake light sockets.
All three bulb types in these specifications conform to ANSI standards applicable in the United States and Canada, indicating standardized sizing and electrical ratings across those markets.