The Ford Freestar brake component utilizes 4157, 3157, and 2458 bulb sizes depending on the specific version of the vehicle being serviced for lighting maintenance. Data provided for the mentioned automotive lighting specifications covers the period from 2004 to 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Freestar uses three bulb types across its brake lighting system: the 4157, 3157, and 921, all of which conform to ANSI standards recognized in both the United States and Canada.
The 4157 and 3157 are both dual-filament wedge bulbs sharing the T25 form factor, 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 function such as running or turn signal operation.
The 921 is a single-filament wedge bulb in the smaller T15 form factor, rated at 12V and 16W, and is used exclusively in the Center High Mount Stop Light on the Ford Freestar.
The Ford Freestar (2006-2007) uses the 4157 bulb for the brake lights, while the 2004-2005 model years use the 3157 for the same position.
Although the 4157 and 3157 share identical T25 form factor and 12V/27W/7W ratings, they are distinct ANSI part numbers and are not confirmed as interchangeable for the Ford Freestar without verification against the specific model year.
The Center High Mount Stop Light specification for the Ford Freestar covers the 2004-2005 model years, both of which use the 921 bulb.