The Chevrolet Metro brake light requires a 1157 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the period from 1998 through 2001.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Metro uses the 1157 bulb for brake lighting across the 1998-2001 model years.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit, typically combining stop and tail light operation through separate filaments rated at 21W and 5W respectively.
The 1157 operates on a BAY15d bayonet base, a two-pin offset base design that prevents incorrect installation by ensuring only one rotational orientation fits the socket.
The center high mount stop light on the Metro uses the 921 bulb for the same 1998-2001 model years.
The 921 is a single-filament wedge-type bulb in the T15 form factor, rated at 12V and 16W, and lacks the dual-filament capability of the 1157.
Because the 1157 and 921 use fundamentally different base types, a bayonet versus a wedge, the two bulbs are not interchangeable with each other.
Both the 1157 and 921 conform to ANSI standards recognized in the United States and Canada, indicating standardized electrical and physical specifications across those markets.
The 1157 bulb is a widely used ANSI-standard type, and aftermarket variants including LED replacements are generally available in the same BAY15d base configuration, though compatibility with the Metro's specific socket and housing would require verification.