Important
Never touch the bulb glass with your bare fingers. Grease and oils from your fingers vaporise from the heat and will leave a deposit on the reflector, which may damage it.
You need to make sure that the new bulb is of the correct type:
Brake light | H21W LL |
Turn the car off.

Press the top edge of the panel cover to make it pivot and remove it.
Move the insulation aside to access the brake light.

Turn the black bulb holder anticlockwise and pull it out.
Press the light bulb and turn it anticlockwise to remove it from the holder.
Insert the new bulb into the bulb holder and turn it clockwise.
Put the black bulb holder back in place and turn it clockwise.
Reposition the insulation.
Reattach the cover panel. Push it in to make sure it's secured.