Freightliner FL106 Brake Bulb Size

The Freightliner FL106 brake light requires a 1157 bulb size for proper installation and function within the rear lighting assembly. Available technical data covers the production span from 1994 to 2003.

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	US Type	EU Type	Shop
1994-2003	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price

Other Locations

Additional Notes

The Freightliner FL106 uses the 1157 bulb across all listed model years, spanning 1994-2003, for its brake light application.
The 1157 is a dual-filament bulb, meaning it carries two separate filaments within a single envelope, one rated at 21W for the brake function and one at 5W for the running light function.
The bulb operates on a 12V electrical system, which is standard for automotive and commercial vehicle lighting circuits.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect insertion by positioning the two pins at different heights along the base.
The 1157 conforms to ANSI standards and is recognized in both the United States and Canada, reflecting its widespread use across North American vehicle applications.
Because the BAY15d base is offset, it is not interchangeable with single-pin bayonet bases or other bayonet configurations, and substituting an incompatible base type will result in a failed fitment.