check your break fluid.
The brake warning light comes on in your dash if the emergency brake is on or the brake fluid level in the brake master cylinder in your engine compartment is LOW
the only one i know is if the P symbol in red is on ur parking break is on, or if the P and ! symbol in red is on its ur break fluid. other sensors might also be wired to these warning lights aswell.
Brake pads could be worn or lack of fluid in brake funnel
Either you're low on break fluid OR your parking brake is set. In either case, it must be repaired.
on a left hand drive it should be next to your clutch peddle.
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.
Either you're out of fluid or the line is clogged somewhere.
it is a warning light
It means that your windshield wiper fluid is at low levels. Simply add more fluid and warning indicator will go away.
Add brake fluid
The windshield washer fluid is low or out.