How do you turn off break citroen c4 Picasso?

To turn off the break warning light on a Citroën C4 Picasso, first ensure that the parking brake is fully released. If the light remains on, check the brake fluid level, as low fluid can trigger the warning. Additionally, inspect the brake system for any faults or issues. If these steps don't resolve the problem, consult the vehicle's manual or a professional mechanic for further assistance.