The Mazda B3000 brake light uses bulb sizes 4157, 2458, and 3157 depending on the specific production period for the vehicle. Data for the lighting components covers the range from 1994 through 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mazda B3000 brake lights use one of two bulb types depending on the model year: the 3157 for 1994-2005 and the 4157 for 2006-2007.
Both the 3157 and 4157 are ANSI-standard dual-filament wedge bulbs in the T25 form factor, each rated at 12V with a 27W/7W output, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary lighting function such as a tail or parking light.
Despite sharing identical voltage, wattage, and T25 form factor ratings, the 3157 and 4157 are not the same part number and are not confirmed as interchangeable within these specifications.
The center high mount stop light (CHMSL) on the Mazda B3000 uses the 906 bulb for 1994-2005 and the 922 bulb for 2006-2007, following the same year-based split seen in the main brake light positions.
The 906 is a single-filament miniature wedge bulb in a T10 form factor, rated at 12V and 8W, making it significantly lower in wattage than the dual-filament T25 bulbs used in the main brake light housings.
The 922 is a single-filament wedge bulb in a T15 form factor, rated at 12V and 16W, placing it between the 906 and the T25 brake bulbs in terms of power output.
The T10 and T15 designations refer to the tubular envelope size of the bulb, with T15 being physically larger than T10, which means the 906 and 922 are not interchangeable despite both being single-filament wedge-base bulbs used in the same CHMSL position across different years.
All four bulb types listed in these specifications conform to ANSI standards applicable in both the United States and Canada.