The Acura MDX brake light utilizes 7440 and 7443 bulb sizes for the lighting components. Data for the specific bulb requirements covers the period from 2001 through 2020.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440 and 7443 are the two bulb types specified for brake lighting across the Acura MDX model range.
Both the 7440 and 7443 follow the T20 wedge form factor and share the same ANSI standard classification for the US and Canadian markets.
The 7440 is a single-filament bulb rated at 12V and 21W, while the 7443 is a dual-filament bulb rated at 12V with filaments at 21W and 5W respectively.
The dual-filament design of the 7443 allows it to serve two brightness levels within a single bulb, which is typical for combined stop and tail light functions.
The Acura MDX (2014-2020) uses the 7440 for the brake light position, representing a single-filament application at that location.
The 2001-2006 MDX uses the 7443 for the brake light position, indicating a dual-filament requirement at that same location in the earlier generation.
Although the 7440 and 7443 share the T20 wedge base, the difference in filament count means the two types are not interchangeable without affecting intended lighting function.
The center high mount stop light on the 2001-2006 MDX uses the 7440, a single-filament bulb, separate from the 7443 specified for the main brake lights on those same model years.
The 2017-2018 MDX carries a distinct outer brake sub-position that also specifies the 7440, indicating that multiple brake light positions on those vehicles share the same bulb type.