The BMW 135i brake light utilizes P21W and H21W bulb sizes for the lighting components located at the rear of the vehicle. Data for the specific bulbs covers the range from 2008 through 2013.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Brake
If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.