How do you change a brake light bulb in a citroen picasso?

you have to take the full light cover off. to do this when you open the boot lid look on the panel right behind the light cover you should see a panel that can be opened when you open this you will see all the wires leading into the light cover. It's quite awkward to get into. you should be able to see or feel the clips on the light cover unhook the clips once you do this the full light cover will release, take it out and you will see all the bulbs change the one you need changed then replace the light unit. Be care full when doing this as the clips are quite brittle and stiff. easily broken. hope this helps