How do you change the brake lights on a Fiat Stilo?

If you are asking about replacing the bulb(s) I did this on my '04 3 door 1.8 dynamique model.

1) Remove two cross headed screws in boot to be able to loosen the carpet trim to gain access to the light.

2) Remove three (10mm - I think) square bolts and unclip electrical wiring to the whole light.

3) Whole light pops out at the rear and the plastic housing can be unclipped giving access to the bayonet bulbs.

4) Replace bulbs and do everything above in the reverse order.

Whole job takes about 10-15 minutes.

Hope that helps.