Not too sure mate but it could have something to do with your break line just check if their bleed proberly.
Its the brake warning light, it is activated when their is a difference in pressure between front and rear brakes. The switch is located under the brake master cylinder.
Sometimes the switch just needs screwing out and putting back in. Of course check fluid levels and obvious faults and leaks
the light looks like this (i) its an electrical problem i think the light is red
Parking brake on
The exclamation point warning light on a BMW 650I indicates low tire pressure.
Brake system warning light.....
The exclamation mark on any sign is an alarm or warning. With a fire symbol, the sign is warning of combustibles nearby.
it means your handbrake is on
An exclamation mark inside a triangle is a warning sign. This can be a warning sign on many devices including a car, a computer, or a cell phone.
The red exclamation point in a circle is the parking brake indicator.
handbrake light
low tire warning
Usually, " warning!!!"
Parking bake is on.
Tire pressure warning light.