Freightliner FL80 Brake Bulb Size

The Freightliner FL80 brake light utilizes a single 1157 bulb size for the lighting system. Available data for the specified vehicle covers the period from 1991 through 2005.

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
1991-2005	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The Freightliner FL80 uses the 1157 bulb for its brake light application across all listed model years, spanning 1991-2005.
The 1157 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by multiple manufacturers.
The 1157 operates on a 12-volt system, which is consistent with standard automotive and commercial vehicle electrical architectures.
As a dual-filament bulb, the 1157 houses two separate filaments within a single envelope, rated at 21 watts and 5 watts respectively, allowing it to serve both high-intensity and low-intensity functions from one unit.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect insertion, as the two pins are positioned at different heights along the base.
The BAY15d base is not interchangeable with single-filament bayonet bases such as the BA15s, which lack the second pin required to activate both filaments.